iio:adc:rockchip: Switch from CONFIG_PM_SLEEP guards to pm_sleep_ptr() etc

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less error prone than the
use of ifdef based config guards.

Removing instances of this approach from IIO also stops them being
copied into new drivers.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220130193147.279148-14-jic23@kernel.org

drivers/iio/adc/rockchip_saradc.c

@@ -481,7 +481,6 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
 	return devm_iio_device_register(&pdev->dev, indio_dev);
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int rockchip_saradc_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
@@ -514,17 +513,17 @@ static int rockchip_saradc_resume(struct device *dev)
 
 	return ret;
 }
-#endif
 
-static SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops,
-			 rockchip_saradc_suspend, rockchip_saradc_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops,
+				rockchip_saradc_suspend,
+				rockchip_saradc_resume);
 
 static struct platform_driver rockchip_saradc_driver = {
 	.probe		= rockchip_saradc_probe,
 	.driver		= {
 		.name	= "rockchip-saradc",
 		.of_match_table = rockchip_saradc_match,
-		.pm	= &rockchip_saradc_pm_ops,
+		.pm	= pm_sleep_ptr(&rockchip_saradc_pm_ops),
 	},
 };