deep_sleep: on S2 disable the brown out detector before deep sleeping

On S2 the brown out detector would occasionally trigger erroneously during deep sleep.

Disable it before sleeping to circumvent this issue.

Closes https://github.com/espressif/esp-idf/issues/6179

components/esp_system/sleep_modes.c

@@ -58,6 +58,7 @@
 #include "esp32s2/clk.h"
 #include "esp32s2/rom/cache.h"
 #include "esp32s2/rom/rtc.h"
+#include "esp32s2/brownout.h"
 #include "soc/extmem_reg.h"
 #include "driver/gpio.h"
 #elif CONFIG_IDF_TARGET_ESP32S3
@@ -588,6 +589,12 @@ inline static uint32_t IRAM_ATTR call_rtc_sleep_start(uint32_t reject_triggers)
 
 void IRAM_ATTR esp_deep_sleep_start(void)
 {
+#if CONFIG_IDF_TARGET_ESP32S2
+    /* Due to hardware limitations, on S2 the brownout detector sometimes trigger during deep sleep
+       to circumvent this we disable the brownout detector before sleeping  */
+    esp_brownout_disable();
+#endif //CONFIG_IDF_TARGET_ESP32S2
+
     // record current RTC time
     s_config.rtc_ticks_at_sleep_start = rtc_time_get();