am c7da28cb: Set interface down in case of "driver stop" command (b/2271658)

Merge commit 'c7da28cb6aa09404070f3479be54e23609552feb' into eclair-plus-aosp

* commit 'c7da28cb6aa09404070f3479be54e23609552feb':
  Set interface down in case of "driver stop" command (b/2271658)