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/ymfpci/ymfpci.h b/sound/pci/ymfpci/ymfpci.h
index bddc405..4631a23 100644
--- a/sound/pci/ymfpci/ymfpci.h
+++ b/sound/pci/ymfpci/ymfpci.h
@@ -363,7 +363,7 @@
 	const struct firmware *dsp_microcode;
 	const struct firmware *controller_microcode;
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 	u32 *saved_regs;
 	u32 saved_ydsxgr_mode;
 	u16 saved_dsxg_legacy;