usb: dwc3: omap: switch over to devm_ioremap_resource()

use the new devm_ioremap_resource on dwc3-omap.c

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index cf20908..ecd9945 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -389,11 +389,9 @@
 		return -EINVAL;
 	}
 
-	base = devm_ioremap_nocache(dev, res->start, resource_size(res));
-	if (!base) {
-		dev_err(dev, "ioremap failed\n");
-		return -ENOMEM;
-	}
+	base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	spin_lock_init(&omap->lock);