Merge pull request sandeepmistry#131 from d00616/fix_rtc

Fix RTC1 EVTENSET/INTENSET and RTC1_IRQHandler

Author: sandeepmistry

cores/nRF5/wiring.c

@@ -41,8 +41,8 @@ void init( void )
   NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
 
   NRF_RTC1->PRESCALER = 0;
-  NRF_RTC1->EVTENSET = RTC_INTENSET_OVRFLW_Msk;
-  NRF_RTC1->INTENSET = RTC_EVTEN_OVRFLW_Msk;
+  NRF_RTC1->INTENSET = RTC_INTENSET_OVRFLW_Msk;
+  NRF_RTC1->EVTENSET = RTC_EVTEN_OVRFLW_Msk;
   NRF_RTC1->TASKS_START = 1;
 }