make VtsHalHidlTestUtils vendor_available so vts tests can be vendor: true. am: f6327d1122

Original change: https://googleplex-android-review.googlesource.com/c/platform/test/vts/+/18452396

Change-Id: I4c83e9aa3fc0f78d2b8a618d96d8da525760390c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>