AP_Mount: use GPS singleton

libraries/AP_Mount/AP_Mount_Alexmos.cpp

@@ -48,7 +48,7 @@ void AP_Mount_Alexmos::update()
 
         // point mount to a GPS point given by the mission planner
         case MAV_MOUNT_MODE_GPS_POINT:
-            if(_frontend._ahrs.get_gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
+            if(AP::gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
                 calc_angle_to_location(_state._roi_target, _angle_ef_target_rad, true, false);
                 control_axis(_angle_ef_target_rad, false);
             }

libraries/AP_Mount/AP_Mount_SToRM32.cpp

@@ -61,7 +61,7 @@ void AP_Mount_SToRM32::update()
 
         // point mount to a GPS point given by the mission planner
         case MAV_MOUNT_MODE_GPS_POINT:
-            if(_frontend._ahrs.get_gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
+            if(AP::gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
                 calc_angle_to_location(_state._roi_target, _angle_ef_target_rad, true, true);
                 resend_now = true;
             }

libraries/AP_Mount/AP_Mount_SToRM32_serial.cpp

@@ -76,7 +76,7 @@ void AP_Mount_SToRM32_serial::update()
 
         // point mount to a GPS point given by the mission planner
         case MAV_MOUNT_MODE_GPS_POINT:
-            if(_frontend._ahrs.get_gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
+            if(AP::gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
                 calc_angle_to_location(_state._roi_target, _angle_ef_target_rad, true, true);
                 resend_now = true;
             }

libraries/AP_Mount/AP_Mount_Servo.cpp

@@ -69,7 +69,7 @@ void AP_Mount_Servo::update()
         // point mount to a GPS point given by the mission planner
         case MAV_MOUNT_MODE_GPS_POINT:
         {
-            if(_frontend._ahrs.get_gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
+            if(AP::gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
                 calc_angle_to_location(_state._roi_target, _angle_ef_target_rad, _flags.tilt_control, _flags.pan_control, false);
                 stabilize();
             }

libraries/AP_Mount/AP_Mount_SoloGimbal.cpp

@@ -70,7 +70,7 @@ void AP_Mount_SoloGimbal::update()
         // point mount to a GPS point given by the mission planner
         case MAV_MOUNT_MODE_GPS_POINT:
             _gimbal.set_lockedToBody(false);
-            if(_frontend._ahrs.get_gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
+            if(AP::gps().status() >= AP_GPS::GPS_OK_FIX_2D) {
                 calc_angle_to_location(_state._roi_target, _angle_ef_target_rad, true, true);
             }
             break;