Introduce w_info_mutex to protect g_manager_info of wifi_manager while limiting the...

Introduce w_info_mutex to protect g_manager_info of wifi_manager while limiting the role of w_mutex to serializing wifi_manager APIs

1. By using this w_info_mutex, deadlock between wifi_manager and slsi_wifi callback is resolved.
2. Introduce additional wifi_manager status: WIFI_MODE_CHAING, WIFI_INITIALIZING, WIFI_DEINITIALIZING, and WIFI_FAILURE.
   In case of WIFI_FAILURE, app developers are requested to deinit and init wifi_manager.
3. wifi_manager_set_mode() returns WIFI_MANAGER_INVALID_ARGS when mode is softap without config.