audio: Add ACDB INIT extension

- Add an audio extension for ACDB
- ACDB Init from AHAL and STHAL are routed via this extension

CRs-Fixed: 2028493
Change-Id: Ib63c8fa4bf1f89d4dbfce8b6584ac1d8271e5f38
diff --git a/hal/Android.mk b/hal/Android.mk
index 9a8d27c..93e4083 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -54,7 +54,8 @@
 	audio_hw.c \
 	voice.c \
 	platform_info.c \
-	$(AUDIO_PLATFORM)/platform.c
+	$(AUDIO_PLATFORM)/platform.c \
+        acdb.c
 
 LOCAL_SRC_FILES += audio_extn/audio_extn.c \
                    audio_extn/utils.c