Tracker: removed init_vehicle from separate vehicles

use common call from AP_BoardConfig

AntennaTracker/system.cpp

@@ -88,9 +88,6 @@ void Tracker::init_tracker()
     // initialise rc channels including setting mode
     rc().init();
 
-    // run all the vehicle initialization routines
-    init_vehicle();
-
     // initialise servos
     init_servos();