compat-wireless: adapt moving brcm80211 to main area

compat-wireless: adapt moving brcm80211 to main area

brcm80211 is no staging driver any more and can be found in the main
area where all the other wireless drivers are now. There where some
changes needed for the move.
And BRCMFMAC does not depend on WEXT any more so remove that from
config.
BRCMFMAC does not build with kernel < 2.6.29, because
ndev->netdev_ops = NULL and ndev->netdev_ops == &brcmf_netdev_ops_pri
are not supported by the backport code for netdev_ops.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>