Extended to support PX4FMU_V4 hw

ROMFS/px4fmu_common/init.d/rc.sensors

@@ -67,6 +67,28 @@ then
 		fi
 	fi
 else
+	if ver hwcmp PX4FMU_V4
+	then
+		# External I2C bus
+		if hmc5883 -C -T -X start
+		then
+		fi
+
+		# Internal SPI bus
+		if hmc5883 -C -T -S -R 8 start
+		then
+		fi
+
+		# Internal SPI bus mpu9250 is rotated ??
+		if mpu9250 -R 0 start
+		then
+		fi
+
+		# Internal SPI bus try MPU6K on ICM-20608-G is rotated 180 deg roll, 270 deg yaw
+		if mpu6000 -R 14 start
+		then
+		fi
+	else
 		# FMUv1
 		if mpu6000 start
 		then
@@ -96,6 +118,7 @@ else
 				fi
 			fi
 		fi
+	fi
 fi
 
 if meas_airspeed start