wpa_driver_nl80211_driver_cmd: ignore certain commands

  - ignore (pretend success) these commands:
     COUNTRY, SETBAND, BTCOEXSCAN-START, BTCOEXSCAN-STOP

Change-Id: Icd5376b0a9368a185b03883d2be205f471ce6bee
wpa_driver_nl80211_driver_cmd: improve failed cmd error log

Change-Id: Idd5af4e7db6c2813bce2d6d7e9a33f2b60f7ea5e