lv_port_esp32: LVGL does not build for ESP32-S2

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Describe the issue

When compiling the build fails: (see below).

I made a fix at https://github.com/cmumford/lv_port_esp32/commit/8697e2cdd05ba3d49393a52f43959cdb92c178a9. However, I don’t yet have an attached screen, so it is untested - it only compiles. I will create a PR for that commit when I have a chance to test the change. (maybe this weekend 🤞)

Code to reproduce the issue

Follow getting started guide: https://github.com/lvgl/lv_port_esp32#get-started except specify the esp32s2 target:

idf.py set-target esp32s2
idf.py menuconfig

Expected Results

Successful build

Actual Results

Failure as shown below

ESP32 Chip version

ESP32-S2

ESP-IDF version

ESP-IDF v4.3-dev-1901-g178b122c1

Development kit used

Cucumber R ESP32-S2 (but never ran on it)

Development machine OS

macOS: 10.15.7

Compilation warnings/errors (if available)

../components/lv_port_esp32/components/lvgl_esp32_drivers/lvgl_helpers.c: In function 'lvgl_spi_driver_init':
../components/lv_port_esp32/components/lvgl_esp32_drivers/lvgl_helpers.c:204:35: error: 'VSPI_HOST' undeclared (first use in this function); did you mean 'FSPI_HOST'?
     assert((SPI_HOST <= host) && (VSPI_HOST >= host));
                                   ^~~~~~~~~
~/esp/esp-idf/components/esp_common/include/esp_compiler.h:29:25: note: in definition of macro 'likely'
 #define likely(x)      (x)
                         ^
../components/lv_port_esp32/components/lvgl_esp32_drivers/lvgl_helpers.c:204:5: note: in expansion of macro 'assert'
     assert((SPI_HOST <= host) && (VSPI_HOST >= host));
     ^~~~~~
../components/lv_port_esp32/components/lvgl_esp32_drivers/lvgl_helpers.c:204:35: note: each undeclared identifier is reported only once for each function it appears in
     assert((SPI_HOST <= host) && (VSPI_HOST >= host));
                                   ^~~~~~~~~
~/esp/esp-idf/components/esp_common/include/esp_compiler.h:29:25: note: in definition of macro 'likely'
 #define likely(x)      (x)
                         ^
../components/lv_port_esp32/components/lvgl_esp32_drivers/lvgl_helpers.c:204:5: note: in expansion of macro 'assert'
     assert((SPI_HOST <= host) && (VSPI_HOST >= host));