make VtsHalHidlTestUtils vendor_available so vts tests can be vendor: true. Bug: 231517902 Test: build vendor VtsHalCameraProviderV2_4TargetTest Change-Id: I8cb0cc165fcde843313fd25b56bfacdc0c166df9 Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>