phy: phy-ralink-usb: convert to devm_platform_ioremap_resource

Use devm_platform_ioremap_resource to simplify code
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1604642930-29019-11-git-send-email-chunfeng.yun@mediatek.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/ralink/phy-ralink-usb.c

@@ -170,7 +170,6 @@ MODULE_DEVICE_TABLE(of, ralink_usb_phy_of_match);
 static int ralink_usb_phy_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 	struct phy_provider *phy_provider;
 	const struct of_device_id *match;
 	struct ralink_usb_phy *phy;
@@ -194,8 +193,7 @@ static int ralink_usb_phy_probe(struct platform_device *pdev)
 
 	/* The MT7628 and MT7688 require extra setup of PHY registers. */
 	if (of_device_is_compatible(dev->of_node, "mediatek,mt7628-usbphy")) {
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		phy->base = devm_ioremap_resource(&pdev->dev, res);
+		phy->base = devm_platform_ioremap_resource(pdev, 0);
 		if (IS_ERR(phy->base)) {
 			dev_err(dev, "failed to remap register memory\n");
 			return PTR_ERR(phy->base);