ASoC: rcar: Convert to SYSTEM_SLEEP_PM_OPS()

Use the newer SYSTEM_SLEEP_PM_OPS() macro instead of
SET_SYSTEM_SLEEP_PM_OPS() together with pm_ptr(), which allows us to
drop ugly __maybe_unused attributes.

This optimizes slightly when CONFIG_PM is disabled, too.

Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250317095603.20073-75-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: tiwai

sound/soc/renesas/rcar/core.c

@@ -2059,7 +2059,7 @@ static void rsnd_remove(struct platform_device *pdev)
 		remove_func[i](priv);
 }
 
-static int __maybe_unused rsnd_suspend(struct device *dev)
+static int rsnd_suspend(struct device *dev)
 {
 	struct rsnd_priv *priv = dev_get_drvdata(dev);
 
@@ -2068,21 +2068,21 @@ static int __maybe_unused rsnd_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused rsnd_resume(struct device *dev)
+static int rsnd_resume(struct device *dev)
 {
 	struct rsnd_priv *priv = dev_get_drvdata(dev);
 
 	return rsnd_adg_clk_enable(priv);
 }
 
 static const struct dev_pm_ops rsnd_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(rsnd_suspend, rsnd_resume)
+	SYSTEM_SLEEP_PM_OPS(rsnd_suspend, rsnd_resume)
 };
 
 static struct platform_driver rsnd_driver = {
 	.driver	= {
 		.name	= "rcar_sound",
-		.pm	= &rsnd_pm_ops,
+		.pm	= pm_ptr(&rsnd_pm_ops),
 		.of_match_table = rsnd_of_match,
 	},
 	.probe		= rsnd_probe,