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/ctmixer.c b/sound/pci/ctxfi/ctmixer.c
index 0cc13ee..48fe0e3 100644
--- a/sound/pci/ctxfi/ctmixer.c
+++ b/sound/pci/ctxfi/ctmixer.c
@@ -1118,7 +1118,7 @@
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int mixer_resume(struct ct_mixer *mixer)
 {
 	int i, state;
@@ -1188,7 +1188,7 @@
 	mixer->get_output_ports = mixer_get_output_ports;
 	mixer->set_input_left = mixer_set_input_left;
 	mixer->set_input_right = mixer_set_input_right;
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 	mixer->resume = mixer_resume;
 #endif