GCS_MAVLink: forward gimbal-device-information to AP_Mount

Co-authored-by: Randy Mackay <rmackay9@yahoo.com>

also forward gimbal_device_attitude_status

libraries/GCS_MAVLink/GCS_Common.cpp

@@ -3629,6 +3629,8 @@ void GCS_MAVLINK::handle_common_message(const mavlink_message_t &msg)
         break;
 
     case MAVLINK_MSG_ID_GIMBAL_REPORT:
+    case MAVLINK_MSG_ID_GIMBAL_DEVICE_INFORMATION:
+    case MAVLINK_MSG_ID_GIMBAL_DEVICE_ATTITUDE_STATUS:
         handle_mount_message(msg);
         break;