staging: brcm80211: remove brcms_b_dotxstatus wrapper function

- removed brcms_b_dotxstatus
- changed 'fatal' argument of brcms_b_txstatus from INOUT to OUT.

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