iio:light:tcs3472: 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>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220130193147.279148-27-jic23@kernel.org

drivers/iio/light/tcs3472.c

@@ -572,7 +572,6 @@ static int tcs3472_remove(struct i2c_client *client)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int tcs3472_suspend(struct device *dev)
 {
 	struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
@@ -598,9 +597,9 @@ static int tcs3472_resume(struct device *dev)
 
 	return ret;
 }
-#endif
 
-static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend,
+				tcs3472_resume);
 
 static const struct i2c_device_id tcs3472_id[] = {
 	{ "tcs3472", 0 },
@@ -611,7 +610,7 @@ MODULE_DEVICE_TABLE(i2c, tcs3472_id);
 static struct i2c_driver tcs3472_driver = {
 	.driver = {
 		.name	= TCS3472_DRV_NAME,
-		.pm	= &tcs3472_pm_ops,
+		.pm	= pm_sleep_ptr(&tcs3472_pm_ops),
 	},
 	.probe		= tcs3472_probe,
 	.remove		= tcs3472_remove,