cpuidle: kirkwood: convert to devm_platform_ioremap_resource()

Use devm_platform_ioremap_resource() to simplify code.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpuidle/cpuidle-kirkwood.c

@@ -55,10 +55,7 @@ static struct cpuidle_driver kirkwood_idle_driver = {
 /* Initialize CPU idle by registering the idle states */
 static int kirkwood_cpuidle_probe(struct platform_device *pdev)
 {
-	struct resource *res;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	ddr_operation_base = devm_ioremap_resource(&pdev->dev, res);
+	ddr_operation_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(ddr_operation_base))
 		return PTR_ERR(ddr_operation_base);