staging: brcm80211: allow both driver are created in single build

This patch allows to build both drivers. Previous patch for this
failed using -j option. This has been fixed by adding files with
include statement for the fullmac driver. Verified this is working
using -j4 option.

Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>