Add VTS tests for the primary audio hal

Test: run the vts test on target
Test: vts-tradefed r vts-hal-hidl -m VtsHalAudioV2_0Target

Bug: 34170075
Change-Id: I4bd6cb0aa5b7cc628537cd7c024542c4db8b592d
Signed-off-by: Kevin Rocard <krocard@google.com>
diff --git a/audio/Android.bp b/audio/Android.bp
index 3121a36..8a1e892 100644
--- a/audio/Android.bp
+++ b/audio/Android.bp
@@ -1,6 +1,7 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "2.0",
+    "2.0/vts/functional",
     "common/2.0",
     "effect/2.0",
     "effect/2.0/vts/functional",