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/ctxfi/cthardware.h b/sound/pci/ctxfi/cthardware.h
index c56fe53..5977e9a 100644
--- a/sound/pci/ctxfi/cthardware.h
+++ b/sound/pci/ctxfi/cthardware.h
@@ -72,7 +72,7 @@
 	int (*card_init)(struct hw *hw, struct card_conf *info);
 	int (*card_stop)(struct hw *hw);
 	int (*pll_init)(struct hw *hw, unsigned int rsr);
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 	int (*suspend)(struct hw *hw);
 	int (*resume)(struct hw *hw, struct card_conf *info);
 #endif