staging: brcm80211: remove code for unsupported chipsets from brcmsmac

The brcmsmac driver code contains code fragments for chipsets that are not
supported. These have been removed from the brcmsmac source files.

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