esp32: fix WiFi stop bug in WiFi/BT coexist mode

This fix includes following changes:
1. Fix the bug that esp_restart()/esp_wifi_stop() sometimes fails in WiFi/BT coexist mode.
2. Add a timer for WiFi stop and stop WiFi forcibly once the timer expires.

diff --git a/components/esp32/lib b/components/esp32/lib
index 7618d9f8d0e1cde21b6aa6e206420dbae5669c46..2282e7a684c329cebb67201989f4bd47b3623acc 160000 (submodule)
--- a/components/esp32/lib
+++ b/components/esp32/lib
@@ -1 +1 @@
-Subproject commit 7618d9f8d0e1cde21b6aa6e206420dbae5669c46
+Subproject commit 2282e7a684c329cebb67201989f4bd47b3623acc