audio: audio encoder/decoder enhancement

- Enable decoder test app for AAC, AMR,
  AMRWB, and MP3 formats.
- Enable encoder for AMRWB, AAC, EVRC,
  and QCELP formats.

Change-Id: I0c75dcc4fb02044f127270a64d3578d62bf6eeda
diff --git a/mm-audio/Makefile b/mm-audio/Makefile
new file mode 100644
index 0000000..2be93e9
--- /dev/null
+++ b/mm-audio/Makefile
@@ -0,0 +1,10 @@
+all:
+	@echo "invoking omxaudio make"
+	$(MAKE) -C adec-mp3
+	$(MAKE) -C adec-aac
+	$(MAKE) -C aenc-aac
+
+install:
+	$(MAKE) -C adec-mp3 install
+	$(MAKE) -C adec-aac install
+	$(MAKE) -C aenc-aac install