Add audio-route to pathmap.mk

Change-Id: Id72a839c188fdc93a6a10f53033f09aded23782e
diff --git a/core/pathmap.mk b/core/pathmap.mk
index 4aec521..b2d5aba 100644
--- a/core/pathmap.mk
+++ b/core/pathmap.mk
@@ -51,6 +51,7 @@
     system-core:system/core/include \
     audio-effects:system/media/audio_effects/include \
     audio-utils:system/media/audio_utils/include \
+    audio-route:system/media/audio_route/include \
     wilhelm:frameworks/wilhelm/include \
     wilhelm-ut:frameworks/wilhelm/src/ut \
     speex:external/speex/include