Tracker: handle common GPS messages in base GCS_MAVLINK class

AntennaTracker/GCS_Mavlink.cpp

@@ -817,12 +817,6 @@ mission_failed:
         handle_gps_inject(msg, tracker.gps);
         break;
 
-    case MAVLINK_MSG_ID_GPS_RTCM_DATA:
-    case MAVLINK_MSG_ID_GPS_INPUT:
-    case MAVLINK_MSG_ID_HIL_GPS:
-        tracker.gps.handle_msg(msg);
-        break;
-
     case MAVLINK_MSG_ID_AUTOPILOT_VERSION_REQUEST:
         send_autopilot_version(FIRMWARE_VERSION);
         break;
@@ -895,6 +889,11 @@ void Tracker::gcs_retry_deferred(void)
     gcs().service_statustext();
 }
 
+AP_GPS *GCS_MAVLINK_Tracker::get_gps() const
+{
+    return &tracker.gps;
+}
+
 Compass *GCS_MAVLINK_Tracker::get_compass() const
 {
     return &tracker.compass;

AntennaTracker/GCS_Mavlink.h

@@ -20,6 +20,7 @@ protected:
     AP_Mission *get_mission() override { return nullptr; };
     AP_Rally *get_rally() const override { return nullptr; };
     AP_ServoRelayEvents *get_servorelayevents() const override { return nullptr; }
+    AP_GPS *get_gps() const override;
 
     uint8_t sysid_my_gcs() const override;