reset: ath79: Use devm_platform_ioremap_resource()

Convert platform_get_resource(), devm_ioremap_resource() to a single
call to Use devm_platform_ioremap_resource(), as this is exactly
what this function does.

Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Ye Xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/202302161049100728015@zte.com.cn
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

Author: Ye Xingchen

drivers/reset/reset-ath79.c

@@ -86,7 +86,6 @@ static int ath79_reset_restart_handler(struct notifier_block *nb,
 static int ath79_reset_probe(struct platform_device *pdev)
 {
 	struct ath79_reset *ath79_reset;
-	struct resource *res;
 	int err;
 
 	ath79_reset = devm_kzalloc(&pdev->dev,
@@ -96,8 +95,7 @@ static int ath79_reset_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, ath79_reset);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	ath79_reset->base = devm_ioremap_resource(&pdev->dev, res);
+	ath79_reset->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ath79_reset->base))
 		return PTR_ERR(ath79_reset->base);