Rover: stop pointlessly passing serial manager around

APMrover2/system.cpp

@@ -44,7 +44,7 @@ void Rover::init_ardupilot()
     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
@@ -81,7 +81,7 @@ void Rover::init_ardupilot()
     barometer.init();
 
     // setup telem slots with serial ports
-    gcs().setup_uarts(serial_manager);
+    gcs().setup_uarts();
 
 #if OSD_ENABLED == ENABLED
     osd.init();