mavlink: Populate baro device ID

TODO - use unique HW ID

src/modules/mavlink/mavlink_receiver.cpp

@@ -1802,6 +1802,9 @@ MavlinkReceiver::handle_message_hil_sensor(mavlink_message_t *msg)
 		baro.altitude = imu.pressure_alt;
 		baro.temperature = imu.temperature;
 
+		/* TODO get device ID for sensor */
+		baro.device_id = 0;
+
 		if (_baro_pub == nullptr) {
 			_baro_pub = orb_advertise(ORB_ID(sensor_baro), &baro);