APMrover2: use function name for AP_Scheduler task name

That makes it easier to identify tasks when debug is enabled in AP_Scheduler.

APMrover2/APMrover2.cpp

@@ -39,8 +39,10 @@ Rover rover;
 
 #define SCHED_TASK(func, _interval_ticks, _max_time_micros) {\
     .function = FUNCTOR_BIND(&rover, &Rover::func, void),\
+    AP_SCHEDULER_NAME_INITIALIZER(func)\
     .interval_ticks = _interval_ticks,\
-    .max_time_micros = _max_time_micros}
+    .max_time_micros = _max_time_micros,\
+}
 
 /*
   scheduler table - all regular tasks should be listed here, along