brownout: fix rtc_brownout_isr_handler signature
Merges
#define BROWNOUT_DET_LVL 0
#endif //CONFIG_ESP32_BROWNOUT_DET_LVL
-static void rtc_brownout_isr_handler(void)
+static void rtc_brownout_isr_handler(void *arg)
{
/* Normally RTC ISR clears the interrupt flag after the application-supplied
* handler returns. Since restart is called here, the flag needs to be
