[ALSA] isa libs Makefiles cleanup

This patch uses the Kconfig parameters SND_AD1848_LIB and
SND_CS4231_LIB instead of mentioning each driver that requires
the ad1848-lib or cs4231-lib separately in the Makefiles.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/isa/ad1848/Makefile b/sound/isa/ad1848/Makefile
index 45d5999..5c7e3fd 100644
--- a/sound/isa/ad1848/Makefile
+++ b/sound/isa/ad1848/Makefile
@@ -7,9 +7,6 @@
 snd-ad1848-objs := ad1848.o
 
 # Toplevel Module Dependency
-obj-$(CONFIG_SND_CMI8330) += snd-ad1848-lib.o
-obj-$(CONFIG_SND_SGALAXY) += snd-ad1848-lib.o
-obj-$(CONFIG_SND_AD1848) += snd-ad1848.o snd-ad1848-lib.o
-obj-$(CONFIG_SND_OPTI92X_AD1848) += snd-ad1848-lib.o
+obj-$(CONFIG_SND_AD1848) += snd-ad1848.o
+obj-$(CONFIG_SND_AD1848_LIB) += snd-ad1848-lib.o
 
-obj-m := $(sort $(obj-m))