RC_Channel: Correct AHRS_ENABLED macro

Author: rishabsingh3003

libraries/RC_Channel/RC_Channel.cpp

@@ -733,6 +733,7 @@ void RC_Channel::init_aux_function(const AUX_FUNC ch_option, const AuxSwitchPos
 #endif
         break;
 
+    // these functions require explicit initialization
 #if HAL_ADSB_ENABLED
     case AUX_FUNC::AVOID_ADSB:
 #endif
@@ -786,9 +787,9 @@ void RC_Channel::init_aux_function(const AUX_FUNC ch_option, const AuxSwitchPos
 #endif
 #if AP_AHRS_ENABLED
     case AUX_FUNC::AHRS_TYPE:
+#endif
         run_aux_function(ch_option, ch_flag, AuxFuncTrigger::Source::INIT, ch_in);
         break;
-#endif
     default:
         GCS_SEND_TEXT(MAV_SEVERITY_WARNING, "Failed to init: RC%u_OPTION: %u",
                         (unsigned)(this->ch_in+1), (unsigned)ch_option);