esp_wifi: fix some wifi bugs
1. Fix airkiss and esptouch find channel crash issue
2. Fix softAP crash by adding NULL pointer check for handling public action frame
3. Ignore dirtyBuf check when buffer size is larger than 4092
4. Fix rf signal test without 9M rate issue
5. Fix issue with hidden AP scans after connecting AP
6. Fix the watchdog issue when receiving action frame
7. Clear hotspot bss when auth timeout happens
8. Fix the bug for esptouch find hidden AP fail
9. Fixed issue of reason code change from 15 to 204 when provide wrong password
10. Fix set config return value error
11. Fix ampdu age timer memory leak
12. Fix PMK not saved in NVS for SoftAP for PSK mode
zhangyanjiao