staging: brcm80211: remove unused rx status definitions

The file pub.h contained a number of definitions that are not
used in the brcmsmac driver and consequently have been removed.

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