Add VTS for Watermark APIs am: 17a9190730

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/23303872

Change-Id: I3b1a1eeaa92267270954dff90fe76c760a4f5789
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>