AP_GPS: move from HAL_NO_GCS to HAL_GCS_ENABLED

libraries/AP_GPS/AP_GPS_SBF.cpp

@@ -21,6 +21,7 @@
 #include "AP_GPS.h"
 #include "AP_GPS_SBF.h"
 #include <GCS_MAVLink/GCS.h>
+#include <AP_InternalError/AP_InternalError.h>
 #include <stdio.h>
 #include <ctype.h>
 

libraries/AP_GPS/GPS_Backend.cpp

@@ -175,7 +175,7 @@ bool AP_GPS_Backend::should_log() const
 
 void AP_GPS_Backend::send_mavlink_gps_rtk(mavlink_channel_t chan)
 {
-#ifndef HAL_NO_GCS
+#if HAL_GCS_ENABLED
     const uint8_t instance = state.instance;
     // send status
     switch (instance) {