zephyr: tests/kernel/fifo/fifo_timeout fails on nrf51_pca10028 and nrf52_pca10040

Looks like this bug has been failing on this platform since the test was introduced

***** delaying boot 1000ms (per build configuration) *****
***** Booting Zephyr OS 1.12.0-rc2 (delayed boot 1000ms) *****
Running test suite test_fifo_timeout
===================================================================
starting test - test_timeout_empty_fifo
PASS - test_timeout_empty_fifo
===================================================================
starting test - test_timeout_non_empty_fifo
PASS - test_timeout_non_empty_fifo
===================================================================
starting test - test_timeout_fifo_thread
PASS - test_timeout_fifo_thread
===================================================================
starting test - test_timeout_threads_pend_on_fifo
thread (q order: 2, t/o: 0, fifo 0x20000000)
thread (q order: 3, t/o: 10, fifo 0x20000000)
thread (q order: 0, t/o: 20, fifo 0x20000000)
thread (q order: 4, t/o: 30, fifo 0x20000000)
thread (q order: 1, t/o: 40, fifo 0x20000000)
PASS - test_timeout_threads_pend_on_fifo
===================================================================
starting test - test_timeout_threads_pend_on_dual_fifos
thread (q order: 0, t/o: 0, fifo 0x20000010)
thread (q order: 5, t/o: 10, fifo 0x20000000)
FAIL - test_multiple_threads_pending@156. *** thread 3 woke up, expected 2

 Assertion failed at /home/jenkins/workspace/zephyr-master-tcf-v0.11-branch/LABEL/verify/SHARD/3-3/ZEPHYR_GCC_VARIANT/zephyr/zephyr.git/tests/kernel/fifo/fifo_timeout/src/main.c:386: test_timeout_threads_pend_on_dual_fifos: rv not equal to TC_PASS
FAIL - test_timeout_threads_pend_on_dual_fifos
===================================================================
starting test - test_timeout_threads_pend_fail_on_fifo
FAIL - test_multiple_threads_get_data@207. *** thread 7 woke up, expected 0

 Assertion failed at /home/jenkins/workspace/zephyr-master-tcf-v0.11-branch/LABEL/verify/SHARD/3-3/ZEPHYR_GCC_VARIANT/zephyr/zephyr.git/tests/kernel/fifo/fifo_timeout/src/main.c:401: test_timeout_threads_pend_fail_on_fifo: rv not equal to TC_PASS
FAIL - test_timeout_threads_pend_fail_on_fifo
===================================================================
===================================================================
RunID: ci-180601-1931-1716:k8if
PROJECT EXECUTION FAILED

 Assertion failed at /home/jenkins/workspace/zephyr-master-tcf-v0.11-branch/LABEL/verify/SHARD/3-3/ZEPHYR_GCC_VARIANT/zephyr/zephyr.git/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false


 Assertion failed at /home/jenkins/workspace/zephyr-master-tcf-v0.11-branch/LABEL/verify/SHARD/3-3/ZEPHYR_GCC_VARIANT/zephyr/zephyr.git/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false


 Assertion failed at /home/jenkins/workspace/zephyr-master-tcf-v0.11-branch/LABEL/verify/SHARD/3-3/ZEPHYR_GCC_VARIANT/zephyr/zephyr.git/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false

This test also fails with “prj_poll.conf” that is CONFIG_POLL=y in the latest commit: 5b8e4ae4df378d0da32ce36266246fb530a6309d

***** delaying boot 1000ms (per build configuration) *****
***** Booting Zephyr OS v1.12.0-831-g5b8e4ae (delayed boot 1000ms) *****
Running test suite test_fifo_timeout
===================================================================
starting test - test_timeout_empty_fifo
PASS - test_timeout_empty_fifo
===================================================================
starting test - test_timeout_non_empty_fifo
PASS - test_timeout_non_empty_fifo
===================================================================
starting test - test_timeout_fifo_thread
PASS - test_timeout_fifo_thread
===================================================================
starting test - test_timeout_threads_pend_on_fifo
 thread (q order: 2, t/o: 0, fifo 0x20000000)
 thread (q order: 3, t/o: 10, fifo 0x20000000)
 thread (q order: 0, t/o: 20, fifo 0x20000000)
 thread (q order: 4, t/o: 30, fifo 0x20000000)
 thread (q order: 1, t/o: 40, fifo 0x20000000)
PASS - test_timeout_threads_pend_on_fifo
===================================================================
starting test - test_timeout_threads_pend_on_dual_fifos
 thread (q order: 0, t/o: 0, fifo 0x20000010)
 thread (q order: 5, t/o: 10, fifo 0x20000000)
FAIL - test_multiple_threads_pending@156.  *** thread 3 woke up, expected 2

    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:396: test_timeout_threads_pend_on_dual_fifos: rv not equal to TC_PASS

FAIL - test_timeout_threads_pend_on_dual_fifos
===================================================================
starting test - test_timeout_threads_pend_fail_on_fifo
FAIL - test_multiple_threads_get_data@207.  *** thread 7 woke up, expected 0

    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:411: test_timeout_threads_pend_fail_on_fifo: rv not equal to TC_PASS


    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:129: test_thread_pend_and_timeout: packet == NULL is false

FAIL - test_timeout_threads_pend_fail_on_fifo
===================================================================
===================================================================
RunID: :wjv2
PROJECT EXECUTION FAILED

    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false


    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false


    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false


    Assertion failed at /home/pswarnak/workspace/1.12_execution/zephyr/tests/kernel/fifo/fifo_timeout/src/main.c:171: test_thread_pend_and_get_data: packet != NULL is false

This failure(with CONFIG_POLL=y) was not seen in earlier commits.