brcm80211: fmac: remove width parameter from brcmf_sdioh_request_buffer

The function brcmf_sdioh_request_buffer() was requiring a parameter in
its prototype that was not used within the function. It has been
removed consequently.

Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>