usb: dwc3: meson-g12a: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20190802130408.20336-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/dwc3-meson-g12a.c

@@ -386,7 +386,6 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 	struct device		*dev = &pdev->dev;
 	struct device_node	*np = dev->of_node;
 	void __iomem *base;
-	struct resource *res;
 	enum phy_mode otg_id;
 	int ret, i, irq;
 
@@ -394,8 +393,7 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	base = devm_ioremap_resource(dev, res);
+	base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(base))
 		return PTR_ERR(base);