mmc: sunxi: Honour non-removable property in DT

If a board DT describes a cd-gpios property, but also marks the storage
as non-removable, we must ignore the GPIO (as Linux does).

Teach the DM_MMC part of the Allwinner MMC driver about the
non-removable DT property, to fix DM_MMC access on the SoPine and
Pine64-LTS board.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jagan Teki <jagan@openedev.com>

drivers/mmc/sunxi_mmc.c

@@ -658,7 +658,8 @@ static int sunxi_mmc_probe(struct udevice *dev)
 		return ret;
 
 	/* This GPIO is optional */
-	if (!gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
+	if (!dev_read_bool(dev, "non-removable") &&
+	    !gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio,
 				  GPIOD_IS_IN)) {
 		int cd_pin = gpio_get_number(&priv->cd_gpio);