cpufreq: kirkwood: convert to devm_platform_ioremap_resource

Use devm_platform_ioremap_resource() to simplify code.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/kirkwood-cpufreq.c

@@ -102,13 +102,11 @@ static struct cpufreq_driver kirkwood_cpufreq_driver = {
 static int kirkwood_cpufreq_probe(struct platform_device *pdev)
 {
 	struct device_node *np;
-	struct resource *res;
 	int err;
 
 	priv.dev = &pdev->dev;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv.base = devm_ioremap_resource(&pdev->dev, res);
+	priv.base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv.base))
 		return PTR_ERR(priv.base);