target-side test for vibrator hal.

Test: manual

Change-Id: I50701f912e20ea1cfcaab823742ee6cfaa354fd1
diff --git a/vibrator/Android.bp b/vibrator/Android.bp
index ba90f2c..ed19a37 100644
--- a/vibrator/Android.bp
+++ b/vibrator/Android.bp
@@ -2,4 +2,5 @@
 subdirs = [
     "1.0",
     "1.0/default",
+    "1.0/vts/functional",
 ]