usb: gadget: aspeed_udc: Convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Link: https://lore.kernel.org/r/20230726113816.888-9-frank.li@vivo.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/aspeed_udc.c

@@ -1468,7 +1468,6 @@ static int ast_udc_probe(struct platform_device *pdev)
 	enum usb_device_speed max_speed;
 	struct device *dev = &pdev->dev;
 	struct ast_udc_dev *udc;
-	struct resource *res;
 	int rc;
 
 	udc = devm_kzalloc(&pdev->dev, sizeof(struct ast_udc_dev), GFP_KERNEL);
@@ -1484,8 +1483,7 @@ static int ast_udc_probe(struct platform_device *pdev)
 	udc->gadget.name = "aspeed-udc";
 	udc->gadget.dev.init_name = "gadget";
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	udc->reg = devm_ioremap_resource(&pdev->dev, res);
+	udc->reg = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(udc->reg)) {
 		dev_err(&pdev->dev, "Failed to map resources\n");
 		return PTR_ERR(udc->reg);