mmc: au1xmmc: switch to platform_get_irq

platform_get_resource(pdev, IORESOURCE_IRQ) is not recommended for
requesting IRQ's resources, as they can be not ready yet. Using
platform_get_irq() instead is preferred for getting IRQ even if it
was not retrieved earlier.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Link: https://lore.kernel.org/r/20191215175120.3290-13-tiny.windzz@gmail.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/au1xmmc.c

@@ -984,12 +984,9 @@ static int au1xmmc_probe(struct platform_device *pdev)
 		goto out2;
 	}
 
-	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "no IRQ defined\n");
+	host->irq = platform_get_irq(pdev, 0);
+	if (host->irq < 0)
 		goto out3;
-	}
-	host->irq = r->start;
 
 	mmc->ops = &au1xmmc_ops;