AntennaTracker: privatize AHRS logging

AntennaTracker/Log.cpp

@@ -10,13 +10,13 @@ void Tracker::Log_Write_Attitude()
     Vector3f targets;
     targets.y = nav_status.pitch * 100.0f;
     targets.z = wrap_360_cd(nav_status.bearing * 100.0f);
-    logger.Write_Attitude(targets);
+    ahrs.Write_Attitude(targets);
     AP::ahrs_navekf().Log_Write();
-    logger.Write_AHRS2();
+    ahrs.Write_AHRS2();
 #if CONFIG_HAL_BOARD == HAL_BOARD_SITL
     sitl.Log_Write_SIMSTATE();
 #endif
-    logger.Write_POS();
+    ahrs.Write_POS();
 }
 
 struct PACKED log_Vehicle_Baro {