Merge changes from topics "clientmodeimpl_api_cleanup", "remove_wifi_set_country_code_api", "wifimanager_async_remove"

* changes:
  WifiCountry: Use Telephony APIs to get country code
  WifiService: Decouple API calls from ClientModeImpl
  WifiThreadRunner: call() should accept a value to be returned on timeout
  WifiServiceImpl: Remove external async channel usage
tree: 733daf93686dd6d92bca2395af26d7ce85b9f533
  1. service/
  2. PREUPLOAD.cfg