ALSA: PCI: Replace CONFIG_PM with CONFIG_PM_SLEEP

Otherwise we may get compile warnings due to unused functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/nm256/nm256.c

@@ -1377,7 +1377,7 @@ snd_nm256_peek_for_sig(struct nm256 *chip)
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 /*
  * APM event handler, so the card is properly reinitialized after a power
  * event.
@@ -1441,7 +1441,7 @@ static SIMPLE_DEV_PM_OPS(nm256_pm, nm256_suspend, nm256_resume);
 #define NM256_PM_OPS	&nm256_pm
 #else
 #define NM256_PM_OPS	NULL
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
 
 static int snd_nm256_free(struct nm256 *chip)
 {