ASoC: rt9120: Convert to RUNTIME_PM_OPS()

Use the newer RUNTIME_PM_OPS() macro instead of SET_RUNTIME_PM_OPS()
together with pm_ptr(), which allows us dropping ugly __maybe_unused
attributes.

This optimizes slightly when CONFIG_PM is disabled, too.

Cc: Oder Chiou <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>
Reviewed-by: Charles Keepax <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/rt9120.c

···
 	pm_runtime_set_suspended(&i2c->dev);
 }
 
-static int __maybe_unused rt9120_runtime_suspend(struct device *dev)
+static int rt9120_runtime_suspend(struct device *dev)
 {
 	struct rt9120_data *data = dev_get_drvdata(dev);
 
···
 	return 0;
 }
 
-static int __maybe_unused rt9120_runtime_resume(struct device *dev)
+static int rt9120_runtime_resume(struct device *dev)
 {
 	struct rt9120_data *data = dev_get_drvdata(dev);
 
···
 }
 
 static const struct dev_pm_ops rt9120_pm_ops = {
-	SET_RUNTIME_PM_OPS(rt9120_runtime_suspend, rt9120_runtime_resume, NULL)
+	RUNTIME_PM_OPS(rt9120_runtime_suspend, rt9120_runtime_resume, NULL)
 };
 
 static const struct of_device_id __maybe_unused rt9120_device_table[] = {
···
 	.driver = {
 		.name = "rt9120",
 		.of_match_table = rt9120_device_table,
-		.pm = &rt9120_pm_ops,
+		.pm = pm_ptr(&rt9120_pm_ops),
 	},
 	.probe = rt9120_probe,
 	.remove = rt9120_remove,