VTS: USB: vts target test for USB HAL.

Test: vts-tradefed run vts -m UsbHidlTargetTest
Change-Id: Ib2c7b2dce2c8497a28501730fd32c2cd035f9e00
diff --git a/usb/Android.bp b/usb/Android.bp
index bbb3e4b..33f70eb 100644
--- a/usb/Android.bp
+++ b/usb/Android.bp
@@ -1,4 +1,5 @@
 // This is an autogenerated file, do not edit.
 subdirs = [
     "1.0",
+    "1.0/vts/functional",
 ]