Put RtcStopAlarm into IRAM to avoid crash when FS is being read/written and Lora IRQ interrupts it

Author: geza-pycom

esp32/lora/rtc-board.c

@@ -168,7 +168,7 @@ IRAM_ATTR void RtcSetAlarm( uint32_t timeout )
     RtcStartAlarm( timeout );
 }
 
-void RtcStopAlarm( void )
+IRAM_ATTR void RtcStopAlarm( void )
 {
     RtcTimerContext.AlarmState = ALARM_STOPPED;
 }
@@ -246,4 +246,4 @@ static IRAM_ATTR void RtcAlarmIrq( void )
 
     // NOTE: The handler should take less then 1 ms otherwise the clock shifts
     TimerIrqHandler( );
-}
+}