iio:light:tsl2563: 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: Vaishnav M A <vaishnav@beagleboard.org>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220130193147.279148-28-jic23@kernel.org

drivers/iio/light/tsl2563.c

@@ -814,7 +814,6 @@ static int tsl2563_remove(struct i2c_client *client)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int tsl2563_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
@@ -857,11 +856,8 @@ static int tsl2563_resume(struct device *dev)
 	return ret;
 }
 
-static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
-#define TSL2563_PM_OPS (&tsl2563_pm_ops)
-#else
-#define TSL2563_PM_OPS NULL
-#endif
+static DEFINE_SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend,
+				tsl2563_resume);
 
 static const struct i2c_device_id tsl2563_id[] = {
 	{ "tsl2560", 0 },
@@ -885,7 +881,7 @@ static struct i2c_driver tsl2563_i2c_driver = {
 	.driver = {
 		.name	 = "tsl2563",
 		.of_match_table = tsl2563_of_match,
-		.pm	= TSL2563_PM_OPS,
+		.pm	= pm_sleep_ptr(&tsl2563_pm_ops),
 	},
 	.probe		= tsl2563_probe,
 	.remove		= tsl2563_remove,