Write VTS target test for Configstore HAL

Bug: 35915192
Test: make vts -j40 && vts-tradefed run commandAndExit vts
--module VtsHalConfigstoreV1_0Target

Change-Id: I85692a0cf140b62adaa6b5384fea6d3b4090ba98
diff --git a/configstore/Android.bp b/configstore/Android.bp
index 79b63f6..ba3e62e 100644
--- a/configstore/Android.bp
+++ b/configstore/Android.bp
@@ -1,5 +1,6 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "1.0",
+    "1.0/vts/functional",
     "utils",
 ]