Global: remove {begin,end}_atomic from scheduler

These are never used and largely not implemented.

libraries/AP_HAL_Empty/Scheduler.cpp

@@ -42,12 +42,6 @@ bool Scheduler::in_timerprocess() {
     return false;
 }
 
-void Scheduler::begin_atomic()
-{}
-
-void Scheduler::end_atomic()
-{}
-
 void Scheduler::system_initialized()
 {}
 

libraries/AP_HAL_Empty/Scheduler.h

@@ -22,9 +22,6 @@ public:
 
     void     register_timer_failsafe(AP_HAL::Proc, uint32_t period_us);
 
-    void     begin_atomic();
-    void     end_atomic();
-
     void     system_initialized();
 
     void     reboot(bool hold_in_bootloader);

libraries/AP_HAL_FLYMAPLE/Scheduler.cpp

@@ -165,16 +165,6 @@ void FLYMAPLEScheduler::_failsafe_timer_event()
         _failsafe();
 }
 
-void FLYMAPLEScheduler::begin_atomic()
-{
-    noInterrupts();
-}
-
-void FLYMAPLEScheduler::end_atomic()
-{
-    interrupts();
-}
-
 void FLYMAPLEScheduler::_run_timer_procs(bool called_from_isr) 
 {
     _in_timer_proc = true;

libraries/AP_HAL_FLYMAPLE/Scheduler.h

@@ -43,9 +43,6 @@ public:
 
     void     register_timer_failsafe(AP_HAL::Proc, uint32_t period_us);
 
-    void     begin_atomic();
-    void     end_atomic();
-
     void     system_initialized();
 
     void     reboot(bool hold_in_bootloader);

libraries/AP_HAL_Linux/Scheduler.cpp

@@ -397,12 +397,6 @@ bool Scheduler::in_timerprocess()
     return _in_timer_proc;
 }
 
-void Scheduler::begin_atomic()
-{}
-
-void Scheduler::end_atomic()
-{}
-
 void Scheduler::_wait_all_threads()
 {
     int r = pthread_barrier_wait(&_initialized_barrier);

libraries/AP_HAL_Linux/Scheduler.h

@@ -34,9 +34,6 @@ public:
 
     void     register_timer_failsafe(AP_HAL::Proc, uint32_t period_us);
 
-    void     begin_atomic();
-    void     end_atomic();
-
     void     system_initialized();
 
     void     reboot(bool hold_in_bootloader);