PX4-Autopilot: CUAV GPS V5 mag not detected

Describe the bug The CUAV GPS V5 magnetometer connected to a Drotek Pixhawk 3 Pro or a Pixracer does not seem to get detected.

To Reproduce

1. Connect GPS/mag to a Pixracer.
2. Check listener sensor_mag to check if the device shows up.

Log Files and Screenshots

[boot] Fault Log info File No 4 Length 3177 flags:0x01 state:1
[boot] Fault Log is Armed
sercon: Registering CDC/ACM serial driver
sercon: Successfully registered the CDC/ACM serial driver
HW arch: PX4_FMU_V4
FW git-hash: a6a88774637c745ee069c6482a79b7d4b3cc8b12
FW version: 1.10.0 80 (17432704)
FW git-branch: master
OS: NuttX
OS version: Release 7.29.0 (119341311)
OS git-hash: d8da511082646d83a54c6905daca13f0a1a609f0
Build datetime: Oct 31 2019 10:59:45
Build uri: localhost
Toolchain: GNU GCC, 7.2.1 20170904 (release) [ARM/embedded-7-branch revision 255204]
PX4GUID: 000100000000303833363335510d00300041
MCU: STM32F42x, rev. 3
nsh: mount: mount failed: No such device
nsh: mkfatfs: mkfatfs failed: No such device
INFO  [param] selected parameter default file /fs/mtd_params
INFO  [tune_control] Publishing standard tune 16
Board defaults: /etc/init.d/rc.board_defaults
WARN  [safety_button] disabled by CBRK_IO_SAFETY, exiting
ERROR [safety_button] Task start failed (-1)
WARN  [dataman] Could not open data manager file /fs/microsd/dataman
ERROR [dataman] dataman start failed
WARN  [rgbled] no RGB led on bus #1
WARN  [rgbled_ncp5623c] no RGB led on bus #1
nsh: rgbled_pwm: command not found
Board sensors: /etc/init.d/rc.board_sensors
reset done, 50 ms
WARN  [hmc5883] no device on bus 1 (type: 2)
WARN  [lis3mdl] no device on bus 2
INFO  [ist8310] no device on bus 1
BMP280_I2C on I2C bus 1 at 0x76 (bus: 100 KHz, max: 100 KHz)
WARN  [bmp280] id of your baro is not: 0x58
WARN  [bmp280] bus option number is 2
ERROR [bmp280] driver start failed
WARN  [qmc5883] no device on bus 1 (type: 2)
BMM150 on I2C bus 1 at 0x10 (bus: 100 KHz, max: 100 KHz)
WARN  [bmm150] id of magnetometer is not: 0x32
ERROR [bmm150] driver start failed
MS5611_SPI on SPI bus 2 at 3 (20000 KHz)
HMC5883_SPI on SPI bus 1 at 5 (11000 KHz)
WARN  [hmc5883] no device on bus 1 (type: 3)
WARN  [lis3mdl] no device on bus 2
LIS3MDL_SPI on SPI bus 1 at 7 (11000 KHz)
WARN  [lis3mdl] no device on bus 3
WARN  [bmi055] No BMI055 gyro found
WARN  [mpu6000] no device on bus #3 (SPI1)
WARN  [mpu6000] no device on bus #3 (SPI1)
WARN  [bmi055] No BMI055 accel found
INFO  [mpu9250] Bus probed: 3
MPU9250 on SPI bus 1 at 4 (1000 KHz)
ERROR [battery_status] no ADC found: /dev/adc0 (2)
Board extras: /etc/init.d/rc.board_mavlink
INFO  [mavlink] mode: Config, data rate: 800000 B/s on /dev/ttyACM0 @ 57600B
ERROR [mavlink] DM_KEY_MISSION_STATE lock failed
ERROR [mavlink] offboard mission init failed (-1)
INFO  [mavlink] mode: Normal, data rate: 20000 B/s on /dev/ttyS0 @ 921600B
WARN  [mavlink] hardware flow control not supported
Starting MAVLink on /dev/ttyS1
INFO  [mavlink] mode: Normal, data rate: 1200 B/s on /dev/ttyS1 @ 57600B
INFO  [init] Mixer: /etc/mixers/quad_x.main.mix on /dev/pwm_output0
Board extras: /etc/init.d/rc.board_extras
INFO  [logger] logger started (mode=all)
INFO  [logger] log root dir created: /fs/microsd/log

NuttShell (NSH)
nsh> INFO  [ecl/EKF] EKF aligned, (pressure height, IMU buf: 22, OBS buf: 14)
INFO  [frsky_telemetry] Scanning timeout: exiting

nsh> listener sensor_mag

TOPIC: sensor_mag
 sensor_mag_s
        timestamp: 264700518  (0.000555 seconds ago)
        error_count: 0
        device_id: 263178 (Type: 0x04, SPI:1 (0x04)) 
        x: 0.3280
        y: 0.3280
        z: 0.2557
        temperature: 45.1921
        scaling: 0.0015
        x_raw: 186
        y_raw: -186
        z_raw: 150
        is_external: False

PX4 version: a6a88774637c745ee069c6482a79b7d4b3cc8b12