mailbox: mtk-cmdq: 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 <caihuoqing@baidu.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/mtk-cmdq-mailbox.c

@@ -525,7 +525,6 @@ static struct mbox_chan *cmdq_xlate(struct mbox_controller *mbox,
 static int cmdq_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 	struct cmdq *cmdq;
 	int err, i;
 	struct gce_plat *plat_data;
@@ -538,8 +537,7 @@ static int cmdq_probe(struct platform_device *pdev)
 	if (!cmdq)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	cmdq->base = devm_ioremap_resource(dev, res);
+	cmdq->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(cmdq->base))
 		return PTR_ERR(cmdq->base);