Plane: support MAV_CMD_ACCELCAL_VEHICLE_POS

ArduPlane/GCS_Mavlink.cpp

@@ -1511,6 +1511,14 @@ void GCS_MAVLINK_Plane::handleMessage(mavlink_message_t* msg)
             }
             break;
 
+        case MAV_CMD_ACCELCAL_VEHICLE_POS:
+            result = MAV_RESULT_FAILED;
+
+            if (plane.ins.get_acal()->gcs_vehicle_position(packet.param1)) {
+                result = MAV_RESULT_ACCEPTED;
+            }
+            break;
+            
         default:
             break;
         }