staging: brcm80211: cleaned up macros in 802.11.h

Code cleanup. Cleaned up 802.11 type and subtype related macros by using
Linux defines instead of Broadcom defined ones.

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