mavlink: send attitude quaternion in onboard mode

src/modules/mavlink/mavlink_main.cpp

@@ -2015,6 +2015,7 @@ Mavlink::task_main(int argc, char *argv[])
 		configure_stream("EXTENDED_SYS_STATE", 5.0f);
 		configure_stream("HIGHRES_IMU", 50.0f);
 		configure_stream("ATTITUDE", 250.0f);
+		configure_stream("ATTITUDE_QUATERNION", 50.0f);
 		configure_stream("RC_CHANNELS", 20.0f);
 		configure_stream("SERVO_OUTPUT_RAW_0", 10.0f);
 		configure_stream("ALTITUDE", 10.0f);