mailbox: hi6220: Make use of the helper function devm_platform_ioremap_resource()

Use the devm_platform_ioremap_resource() helper instead of
calling platform_get_resource() and devm_ioremap_resource()
separately

Signed-off-by: Cai Huoqing <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

drivers/mailbox/hi6220-mailbox.c

···
 	struct device_node *node = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
 	struct hi6220_mbox *mbox;
-	struct resource *res;
 	int i, err;
 
 	mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
···
 	if (mbox->irq < 0)
 		return mbox->irq;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mbox->ipc = devm_ioremap_resource(dev, res);
+	mbox->ipc = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mbox->ipc)) {
 		dev_err(dev, "ioremap ipc failed\n");
 		return PTR_ERR(mbox->ipc);
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	mbox->base = devm_ioremap_resource(dev, res);
+	mbox->base = devm_platform_ioremap_resource(pdev, 1);
 	if (IS_ERR(mbox->base)) {
 		dev_err(dev, "ioremap buffer failed\n");
 		return PTR_ERR(mbox->base);