TV Input target-side test

Test: make vts; vts-tradefed; run -m HalTvInputHidlTargetTest
Change-Id: Ifd8a178c9d1dde9b8e87ba0ff06aad75a811b420
diff --git a/tv/Android.bp b/tv/Android.bp
index 5ad82f4..ac54910 100644
--- a/tv/Android.bp
+++ b/tv/Android.bp
@@ -2,4 +2,5 @@
 subdirs = [
     "cec/1.0",
     "input/1.0",
+    "input/1.0/vts/functional",
 ]