staging: brcm80211: Remove symbol CONFIG_BRCM80211

Since the staging driver brcm80211 was renamed to brcmsmac, CONFIG_BRCM80211
is not really needed. In addition, a two-entry list hardly needs a separate
config menu.

The only awkward place in the revised code is the double addition of the
brcm80211 Makefile.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>