topic_listener: avoid code generation, use existing metadata at runtime

This reduces flash size for v5 by ~110KB, the topic listener now only adds
about 1.2KB.

src/modules/airship_att_control/airship_att_control_main.cpp

@@ -170,7 +170,7 @@ int AirshipAttitudeControl::print_status()
 
 	perf_print_counter(_loop_perf);
 
-	print_message(_actuators);
+	print_message(ORB_ID(actuator_controls), _actuators);
 
 	return 0;
 }