ArduSub: moved init_safety to AP_Vehicle

ArduSub/system.cpp

@@ -178,9 +178,6 @@ void Sub::init_ardupilot()
 
     ins.set_log_raw_bit(MASK_LOG_IMU_RAW);
 
-    // disable safety if requested
-    BoardConfig.init_safety();
-
     // flag that initialisation has completed
     ap.initialised = true;
 }