wifi: Avoid recalculating PMK when esp_wifi_set_config is not called

Scenarios where this fix is applicable.
1) Every time the system is powered-on/restarted without calling
   esp_wifi_set_config.
2) esp_wifi_init()/connect()/stop()/deinit() is called multiple
   times without esp_wifi_set_config.

Closes IDFGH-1520

components/esp_wifi/lib_esp32

@@ -1 +1 @@
-Subproject commit 8e2ed075db7f4d5f942b5ea354070d6273c01638
+Subproject commit 09ed80c2b047ae5bb41ddbfb9be44ec2bc71fedd