leds: leds-asic3: switch to using SIMPLE_DEV_PM_OPS

Switch to using SIMPLE_DEV_PM_OPS macro to declare the driver's
pm_ops. It reduces code size. Also, CONFIG_PM_SLEEP is added to
suspend/ resume functions to prevent build warnings when
CONFIG_PM_SLEEP is not selected.

Signed-off-by: Jingoo Han <[e-mail]>
Signed-off-by: Bryan Wu <[e-mail]>

drivers/leds/leds-asic3.c

···
 	return mfd_cell_disable(pdev);
 }
 
+#ifdef CONFIG_PM_SLEEP
 static int asic3_led_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
···
 
 	return ret;
 }
+#endif
 
-static const struct dev_pm_ops asic3_led_pm_ops = {
-	.suspend	= asic3_led_suspend,
-	.resume		= asic3_led_resume,
-};
+static SIMPLE_DEV_PM_OPS(asic3_led_pm_ops, asic3_led_suspend, asic3_led_resume);
 
 static struct platform_driver asic3_led_driver = {
 	.probe		= asic3_led_probe,