dm: sunxi: Make sure that GPIOs are requested

The scsi_init() function uses a GPIO so should request it. There is no
way to return an error here, and the request may be made multiple times,
so just ignore errors for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>