U-Boot can't use the sdio card so turn it of to prevent things getting
confused/struck when trying to use the card as storage.
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: NSimon Glass <sjg@chromium.org>
Signed-off-by: NSimon Glass <sjg@chromium.org>