mailbox: platform-mhu: 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/platform_mhu.c

@@ -117,7 +117,6 @@ static int platform_mhu_probe(struct platform_device *pdev)
 	int i, err;
 	struct platform_mhu *mhu;
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 	int platform_mhu_reg[MHU_CHANS] = {
 		MHU_SEC_OFFSET, MHU_LP_OFFSET, MHU_HP_OFFSET
 	};
@@ -127,8 +126,7 @@ static int platform_mhu_probe(struct platform_device *pdev)
 	if (!mhu)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mhu->base = devm_ioremap_resource(dev, res);
+	mhu->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(mhu->base)) {
 		dev_err(dev, "ioremap failed\n");
 		return PTR_ERR(mhu->base);