Add support for Omnibus F4 boards with ICM20608G IMUs

One can use following command to compile:
make omnibus_f4sd_icm20608g

Co-Authored-By: berkercanatar <19846944+berkercanatar@users.noreply.github.com>

boards/omnibus/f4sd/icm20608g.px4board

@@ -0,0 +1,3 @@
+CONFIG_DRIVERS_IMU_INVENSENSE_ICM20602=n
+CONFIG_DRIVERS_IMU_INVENSENSE_MPU6000=n
+CONFIG_DRIVERS_IMU_INVENSENSE_ICM20608G=y

boards/omnibus/f4sd/init/rc.board_sensors

@@ -8,7 +8,11 @@ board_adc start
 if ! mpu6000 -R 6 -s start
 then
 	# some boards such as the Hobbywing XRotor F4 G2 use the ICM-20602
-	icm20602 -s -R 6 start
+	if ! icm20602 -s -R 6 start
+	then
+		# some clones of Omnibus F4 use the ICM-20608G (such as F4 PDB for Martian II FPV Drone)
+		icm20608g -s -R 6 start
+	fi
 fi
 
 bmp280 -s start

boards/omnibus/f4sd/src/spi.cpp

@@ -39,6 +39,7 @@ constexpr px4_spi_bus_t px4_spi_buses[SPI_BUS_MAX_BUS_ITEMS] = {
 	initSPIBus(SPI::Bus::SPI1, {
 		initSPIDevice(DRV_IMU_DEVTYPE_MPU6000, SPI::CS{GPIO::PortA, GPIO::Pin4}),
 		initSPIDevice(DRV_IMU_DEVTYPE_ICM20602, SPI::CS{GPIO::PortA, GPIO::Pin4}),
+		initSPIDevice(DRV_IMU_DEVTYPE_ICM20608G, SPI::CS{GPIO::PortA, GPIO::Pin4}),
 	}),
 	initSPIBus(SPI::Bus::SPI2, {
 		initSPIDevice(SPIDEV_MMCSD(0), SPI::CS{GPIO::PortB, GPIO::Pin12})