ASoC: cs42l83: 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
dropping ugly __maybe_unused attributes.

This optimizes slightly when CONFIG_PM is disabled, too.

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

sound/soc/codecs/cs42l83-i2c.c

···
 	cs42l42_common_remove(cs42l83);
 }
 
-static int __maybe_unused cs42l83_i2c_resume(struct device *dev)
+static int cs42l83_i2c_resume(struct device *dev)
 {
 	int ret;
 
···
 }
 
 static const struct dev_pm_ops cs42l83_i2c_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(cs42l42_suspend, cs42l83_i2c_resume)
+	SYSTEM_SLEEP_PM_OPS(cs42l42_suspend, cs42l83_i2c_resume)
 };
 
 static const struct of_device_id __maybe_unused cs42l83_of_match[] = {
···
 static struct i2c_driver cs42l83_i2c_driver = {
 	.driver = {
 		.name = "cs42l83",
-		.pm = &cs42l83_i2c_pm_ops,
+		.pm = pm_ptr(&cs42l83_i2c_pm_ops),
 		.of_match_table = of_match_ptr(cs42l83_of_match),
 		},
 	.probe = cs42l83_i2c_probe,