shutdown timer on deinit

Author: paul-szczepanek-arm

features/FEATURE_BLE/targets/TARGET_NORDIC/TARGET_NORDIC_CORDIO/TARGET_NRF5x/stack/sources/pal_timer.c

@@ -235,6 +235,7 @@ void PalTimerDeInit(void)
 
       /* stop timer */
       NRF_TIMER2->TASKS_STOP  = 1;
+      NRF_TIMER2->TASKS_SHUTDOWN = 1;
     #endif
   #endif