rtc: imxdi: use devm_platform_ioremap_resource() to simplify code

Use the new helper devm_platform_ioremap_resource() which wraps the
platform_get_resource() and devm_ioremap_resource() together, to
simplify the code.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/20190717081411.30622-1-Anson.Huang@nxp.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-imxdi.c

@@ -740,7 +740,6 @@ static void dryice_work(struct work_struct *work)
  */
 static int __init dryice_rtc_probe(struct platform_device *pdev)
 {
-	struct resource *res;
 	struct imxdi_dev *imxdi;
 	int norm_irq, sec_irq;
 	int rc;
@@ -751,8 +750,7 @@ static int __init dryice_rtc_probe(struct platform_device *pdev)
 
 	imxdi->pdev = pdev;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	imxdi->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+	imxdi->ioaddr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(imxdi->ioaddr))
 		return PTR_ERR(imxdi->ioaddr);