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/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
index 9d1231d..b9c9349 100644
--- a/sound/pci/ctxfi/cthw20k2.c
+++ b/sound/pci/ctxfi/cthw20k2.c
@@ -2201,7 +2201,7 @@
 	return 0;
 }
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int hw_suspend(struct hw *hw)
 {
 	struct pci_dev *pci = hw->pci;
@@ -2250,7 +2250,7 @@
 	.output_switch_put = hw_output_switch_put,
 	.mic_source_switch_get = hw_mic_source_switch_get,
 	.mic_source_switch_put = hw_mic_source_switch_put,
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 	.suspend = hw_suspend,
 	.resume = hw_resume,
 #endif