mmc: Only retrieve cd pin when GPIO is enabled

The driver only needs to retrieve the pin for the ACPI info. The driver
itself works without depending on GPIO.

Signed-off-by: Harm Berntsen <harm.berntsen@nedap.com>
CC: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/pci_mmc.c b/drivers/mmc/pci_mmc.c
index c71c495..b26eb03 100644
--- a/drivers/mmc/pci_mmc.c
+++ b/drivers/mmc/pci_mmc.c
@@ -52,9 +52,11 @@
 
 static int pci_mmc_of_to_plat(struct udevice *dev)
 {
-	struct pci_mmc_priv *priv = dev_get_priv(dev);
+	if (CONFIG_IS_ENABLED(DM_GPIO)) {
+		struct pci_mmc_priv *priv = dev_get_priv(dev);
 
-	gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
+		gpio_request_by_name(dev, "cd-gpios", 0, &priv->cd_gpio, GPIOD_IS_IN);
+	}
 
 	return 0;
 }