am 709a302e: wifi: pass interface to wpa_supplicant

Merge commit '709a302e77c44a3e3ee8359be3f2c9361f05d02c' into gingerbread-plus-aosp

* commit '709a302e77c44a3e3ee8359be3f2c9361f05d02c':
  wifi: pass interface to wpa_supplicant