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/vx222/vx222.c b/sound/pci/vx222/vx222.c
index b89e7a8..fdfbaf857 100644
--- a/sound/pci/vx222/vx222.c
+++ b/sound/pci/vx222/vx222.c
@@ -257,7 +257,7 @@
 	pci_set_drvdata(pci, NULL);
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int snd_vx222_suspend(struct device *dev)
 {
 	struct pci_dev *pci = to_pci_dev(dev);