ASoC: mt6797: 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>
Link: https://lore.kernel.org/r/20190727150738.54764-7-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt6797/mt6797-afe-pcm.c

@@ -749,7 +749,6 @@ static int mt6797_afe_pcm_dev_probe(struct platform_device *pdev)
 {
 	struct mtk_base_afe *afe;
 	struct mt6797_afe_private *afe_priv;
-	struct resource *res;
 	struct device *dev;
 	int i, irq_id, ret;
 
@@ -774,9 +773,7 @@ static int mt6797_afe_pcm_dev_probe(struct platform_device *pdev)
 	}
 
 	/* regmap init */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	afe->base_addr = devm_ioremap_resource(&pdev->dev, res);
+	afe->base_addr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(afe->base_addr))
 		return PTR_ERR(afe->base_addr);