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* remove outdated driver_nl80211.h header, and point to the version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
driver_cmd_nl80211:  Update file for new header file

Change-Id: I7d50a776fb539f45f68b56c119273c1703175bb2