score: Remove Giant lock in rtems_clock_tick()

Update #2307.

cpukit/rtems/src/clocktick.c

@@ -26,23 +26,14 @@
 
 rtems_status_code rtems_clock_tick( void )
 {
-#if defined( RTEMS_SMP )
-  _Thread_Disable_dispatch();
-#endif
-
   _TOD_Tickle_ticks();
 
   _Watchdog_Tickle_ticks();
 
   _Scheduler_Tick();
 
-#if defined( RTEMS_SMP )
-  _Thread_Enable_dispatch();
-#else
-  if ( _Thread_Is_context_switch_necessary() &&
-       _Thread_Dispatch_is_enabled() )
+  if ( _Thread_Dispatch_is_enabled() )
     _Thread_Dispatch();
-#endif
 
   return RTEMS_SUCCESSFUL;
 }

testsuites/sptests/sp37/init.c

@@ -431,11 +431,7 @@ rtems_timer_service_routine test_unblock_task(
   _Thread_Disable_dispatch();
   status = rtems_task_resume( blocked_task_id );
   _Thread_Unnest_dispatch();
-#if defined( RTEMS_SMP )
-  directive_failed_with_level( status, "rtems_task_resume", 1 );
-#else
   directive_failed( status, "rtems_task_resume" );
-#endif
 }
 
 rtems_task Init(