Add VR Hal target test.

Bug: 32022964
Test:  vts-tradefed
Change-Id: If1ae2b3df7ee083b5a0855d883368aefd244531a
diff --git a/vr/Android.bp b/vr/Android.bp
index ba90f2c..ed19a37 100644
--- a/vr/Android.bp
+++ b/vr/Android.bp
@@ -2,4 +2,5 @@
 subdirs = [
     "1.0",
     "1.0/default",
+    "1.0/vts/functional",
 ]