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/ens1370.c b/sound/pci/ens1370.c
index f7e6f73..2ba58d3 100644
--- a/sound/pci/ens1370.c
+++ b/sound/pci/ens1370.c
@@ -2032,7 +2032,7 @@
 	synchronize_irq(ensoniq->irq);
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int snd_ensoniq_suspend(struct device *dev)
 {
 	struct pci_dev *pci = to_pci_dev(dev);
@@ -2094,7 +2094,7 @@
 #define SND_ENSONIQ_PM_OPS	&snd_ensoniq_pm
 #else
 #define SND_ENSONIQ_PM_OPS	NULL
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
 
 static int __devinit snd_ensoniq_create(struct snd_card *card,
 				     struct pci_dev *pci,