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>
diff --git a/sound/pci/trident/trident_main.c b/sound/pci/trident/trident_main.c
index 94011dc..06b10d1 100644
--- a/sound/pci/trident/trident_main.c
+++ b/sound/pci/trident/trident_main.c
@@ -3919,7 +3919,7 @@
 	}
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int snd_trident_suspend(struct device *dev)
 {
 	struct pci_dev *pci = to_pci_dev(dev);
@@ -3983,4 +3983,4 @@
 }
 
 SIMPLE_DEV_PM_OPS(snd_trident_pm, snd_trident_suspend, snd_trident_resume);
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */