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/als300.c b/sound/pci/als300.c
index 68c4469..00f157a 100644
--- a/sound/pci/als300.c
+++ b/sound/pci/als300.c
@@ -765,7 +765,7 @@
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int snd_als300_suspend(struct device *dev)
 {
 	struct pci_dev *pci = to_pci_dev(dev);