Put audio_route into its own library

The audio_route library allows mixer paths to be
loaded from an XML file and can control a mixer
via tinyalsa. It contains useful functions that
can be factored out of the audio HAL.

Change-Id: Iebcb2b492c5936dbf0e0b976aeaa4ffbab136588
diff --git a/audio_route/Android.mk b/audio_route/Android.mk
new file mode 100644
index 0000000..7470dc6
--- /dev/null
+++ b/audio_route/Android.mk
@@ -0,0 +1,12 @@
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_C_INCLUDES += \
+	external/tinyalsa/include \
+	external/expat/lib
+LOCAL_SRC_FILES:= audio_route.c
+LOCAL_MODULE := libaudioroute
+LOCAL_SHARED_LIBRARIES:= liblog libcutils libutils libexpat libtinyalsa
+LOCAL_MODULE_TAGS := optional
+LOCAL_PRELINK_MODULE := false
+include $(BUILD_SHARED_LIBRARY)