ALSA: aoa: clean up file names

This cleans up the apple onboard audio driver filenames.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/aoa/core/Makefile b/sound/aoa/core/Makefile
index 62dc728..a1596e8 100644
--- a/sound/aoa/core/Makefile
+++ b/sound/aoa/core/Makefile
@@ -1,5 +1,5 @@
 obj-$(CONFIG_SND_AOA) += snd-aoa.o
-snd-aoa-objs := snd-aoa-core.o \
-		snd-aoa-alsa.o \
-		snd-aoa-gpio-pmf.o \
-		snd-aoa-gpio-feature.o
+snd-aoa-objs := core.o \
+		alsa.o \
+		gpio-pmf.o \
+		gpio-feature.o