dmaengine: rcar-dmac: Use devm_platform_ioremap_resource()

This patch uses devm_platform_ioremap_resource() instead of
using platform_get_resource() and devm_ioremap_resource() together
to simplify.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Link: https://lore.kernel.org/r/1568010892-17606-4-git-send-email-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/sh/rcar-dmac.c

@@ -1824,7 +1824,6 @@ static int rcar_dmac_probe(struct platform_device *pdev)
 	struct dma_device *engine;
 	struct rcar_dmac *dmac;
 	const struct rcar_dmac_of_data *data;
-	struct resource *mem;
 	unsigned int i;
 	int ret;
 
@@ -1863,8 +1862,7 @@ static int rcar_dmac_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* Request resources. */
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	dmac->iomem = devm_ioremap_resource(&pdev->dev, mem);
+	dmac->iomem = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(dmac->iomem))
 		return PTR_ERR(dmac->iomem);