staging: brcm80211: removed BDC defines

Code cleanup. BDC (Broadcom Device Class) protocol extension is used on top
of the USB related CDC (Communication Device Class) definition. BDC is always
used, so the #ifdefs were redundant.

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