Newer Linksys boards might come with a Winbond W29N02GV which can be
configured in different ways. Make sure we configure it the same way
as the older chips so everything keeps working.

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>