fix ath6kl-compat wpa private library

resolves problems with wifi (missing mac address, no resume from
sleep).

* remove outdated driver_nl80211.h header, and point to the version
  in hardware_legacy includes

Change-Id: Ib2e58652a6b99f780837d34c1c6a298c56075846
sync driver_cmd_nl80211 to upstream

Change-Id: I345f13fb2fde845223c61d1828e4be989fd205d8