esp32: Fix wifi stop never return issue

Fix esp_wifi_stop() never return issue

diff --git a/components/esp32/lib b/components/esp32/lib
index 09819d4eb7ca86f9e75fc0f7cc8ed607b6a87a17..e7921eea87eded9a34e31f55c1959fd22dd43f4c 160000 (submodule)
--- a/components/esp32/lib
+++ b/components/esp32/lib
@@ -1 +1 @@
-Subproject commit 09819d4eb7ca86f9e75fc0f7cc8ed607b6a87a17
+Subproject commit e7921eea87eded9a34e31f55c1959fd22dd43f4c