staging: brcm80211: remove defines from bcmsrom.c

Two macro definitions in the file were either not used or meaningless and
have been removed.

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