bmi055 initial integration

src/platforms/px4_spi.h

@@ -16,6 +16,7 @@ enum spi_dev_e {
 	SPIDEV_MUX,         /* Select SPI multiplexer device */
 	SPIDEV_AUDIO_DATA,  /* Select SPI audio codec device data port */
 	SPIDEV_AUDIO_CTRL,  /* Select SPI audio codec device control port */
+	SPIDEV_BMI055_GYR /* Select SPI BMI055 Gyroscope */
 };
 
 /* Certain SPI devices may required different clocking modes */