Merge changes I66dbef26,Id5c1d2f2

* changes:
  WifiStateMachine: allow config removal
  WifiStateMachine: add delete config helper method
tree: 708cc177eda18d52ba6dca7178cc197db70b553f
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/
  5. PREUPLOAD.cfg