usb: gadget: at91_udc: fix dt support

Don't fail the initialization check for the platform_data
if there is avaiable an associated device tree node.
Signed-off-by: NFabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/at91_udc.c

@@ -1704,7 +1704,7 @@ static int __devinit at91udc_probe(struct platform_device *pdev)
 	int		retval;
 	struct resource	*res;
 
-	if (!dev->platform_data) {
+	if (!dev->platform_data && !pdev->dev.of_node) {
 		/* small (so we copy it) but critical! */
 		DBG("missing platform_data\n");
 		return -ENODEV;