ALSA: als4000: Replace with DEFINE_SIMPLE_DEV_PM_OPS()

Use the new DEFINE_SIMPLE_DEV_PM_OPS() instead of SIMPLE_DEV_PM_OPS()
for code-simplification. We need no longer CONFIG_PM_SLEEP ifdefs.

For building properly, add the dummy functions for
snd_sbmixer_suspend/resume() functions, too.

Just a cleanup, no functional changes.

Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

include/sound/sb.h

···
 #ifdef CONFIG_PM
 void snd_sbmixer_suspend(struct snd_sb *chip);
 void snd_sbmixer_resume(struct snd_sb *chip);
+#else
+static inline void snd_sbmixer_suspend(struct snd_sb *chip) {}
+static inline void snd_sbmixer_resume(struct snd_sb *chip) {}
 #endif
 
 /* sb8_init.c */

sound/pci/als4000.c

···
 	return snd_card_free_on_error(&pci->dev, __snd_card_als4000_probe(pci, pci_id));
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int snd_als4000_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
···
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(snd_als4000_pm, snd_als4000_suspend, snd_als4000_resume);
-#define SND_ALS4000_PM_OPS	&snd_als4000_pm
-#else
-#define SND_ALS4000_PM_OPS	NULL
-#endif /* CONFIG_PM_SLEEP */
+static DEFINE_SIMPLE_DEV_PM_OPS(snd_als4000_pm, snd_als4000_suspend, snd_als4000_resume);
 
 static struct pci_driver als4000_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = snd_als4000_ids,
 	.probe = snd_card_als4000_probe,
 	.driver = {
-		.pm = SND_ALS4000_PM_OPS,
+		.pm = &snd_als4000_pm,
 	},
 };