config: use CFG80211 for bcmdhd

CFG80211 is needed for WFD. So, use CFG80211,
instead of, WEXT in bcmdhd driver.

Bug 1029792
Bug 1029733

Change-Id: I81d99a821429f3be8400355faa5bee14904c0944
Signed-off-by: Mursalin Akon <makon@nvidia.com>
Reviewed-on: http://git-master/r/141630
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Matthew Pedro <mapedro@nvidia.com>
GVS: Gerrit_Virtual_Submit