staging: brcm80211: remove static function declaration in wl_cfg80211

Reshuffle function order in wl_cfg80211 of fullmac to get rid of
static function declaration
Reported-by: NJohannes Berg <johannes@sipsolutions.net>
Reviewed-by: NArend van Spriel <arend@broadcom.com>
Reviewed-by: NRoland Vossen <rvossen@broadcom.com>
Signed-off-by: NRoland Vossen <rvossen@broadcom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>