brcmfmac: replace cfg80211 testmode with vendor command

Passing a pointer from user space and using it directly in driver is not a
preferable behavior. Switch to cfg80211 vendor mode for dongle command for
better cross platform compatibility.

Reviewed-by: Daniel (Deognyoun) Kim <dekim@broadcom.com>
Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/brcm80211/brcmfmac/Makefile
Simple merge

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

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

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

diff --cc drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
Simple merge