reset: lpc18xx: 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/202302161053360618204@zte.com.cn
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

Author: Ye Xingchen

drivers/reset/reset-lpc18xx.c

@@ -139,16 +139,14 @@ static const struct reset_control_ops lpc18xx_rgu_ops = {
 static int lpc18xx_rgu_probe(struct platform_device *pdev)
 {
 	struct lpc18xx_rgu_data *rc;
-	struct resource *res;
 	u32 fcclk, firc;
 	int ret;
 
 	rc = devm_kzalloc(&pdev->dev, sizeof(*rc), GFP_KERNEL);
 	if (!rc)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	rc->base = devm_ioremap_resource(&pdev->dev, res);
+	rc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rc->base))
 		return PTR_ERR(rc->base);