Upstream driver has gone through a series of cleanup and was moved
from drivers/staging into drivers/spi. Backport it to replace our
messy driver.
Tested-by: Jörg Schüler-Maroldt <joerg-linux@arcor.de>
[LinkIt Smart 7688, AcSIP AI7688H Wi-Fi module]
Tested-by: Rosen Penev <rosenp@gmail.com>
Tested-by: Tian Xiao bo <peterwillcn@gmail.com>
[Newifi-D2 MediaTek MT7621 ver:1 eco:3]
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
d80a1c6e2c