staging: brcm80211: further simplified register access macro's

The SELECT_BUS_READ and SELECT_BUS_WRITE macro's always select
a (sdio) bus operation for fullmac, and a memory operation for
softmac. Thus they can be removed by expanding them in place.

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