Tracker: stop pointlessly passing serial manager around

AntennaTracker/system.cpp

@@ -26,7 +26,7 @@ void Tracker::init_tracker()
     serial_manager.init();
 
     // setup first port early to allow BoardConfig to report errors
-    gcs().chan(0).setup_uart(serial_manager, AP_SerialManager::SerialProtocol_MAVLink, 0);
+    gcs().chan(0).setup_uart(AP_SerialManager::SerialProtocol_MAVLink, 0);
 
     // Register mavlink_delay_cb, which will run anytime you have
     // more than 5ms remaining in your call to hal.scheduler->delay
@@ -50,7 +50,7 @@ void Tracker::init_tracker()
     barometer.init();
 
     // setup telem slots with serial ports
-    gcs().setup_uarts(serial_manager);
+    gcs().setup_uarts();
 
 #if LOGGING_ENABLED == ENABLED
     log_init();