brcmfmac: follow user-space regulatory domain selection

When user-space uses a valid ISO-3166-1 country code for its
regulatory domain selection, the driver will try to configure
the firmware to use the same.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --cc drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/fwil_types.h
Simple merge