staging: brcm80211: remove BCMLXSDMMC macro definition

The conditional code depending on BCMLXSDMMC macro definition is
always compiled into the fullmac driver.

Signed-off-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>