[ALSA] Clean up Makefile

Clean up Makefile using xxx- style instead of
ifeq(CONFIG_XXX,y).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/pci/cs5535audio/Makefile

@@ -2,11 +2,8 @@
 # Makefile for cs5535audio
 #
 
-snd-cs5535audio-objs := cs5535audio.o cs5535audio_pcm.o
-
-ifeq ($(CONFIG_PM),y)
-snd-cs5535audio-objs += cs5535audio_pm.o
-endif
+snd-cs5535audio-y := cs5535audio.o cs5535audio_pcm.o
+snd-cs5535audio-$(CONFIG_PM) += cs5535audio_pm.o
 
 # Toplevel Module Dependency
 obj-$(CONFIG_SND_CS5535AUDIO) += snd-cs5535audio.o