Add VTS for Watermark APIs am: 17a9190730 am: a311d90492

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

Change-Id: Id9fe5391bbb19f8636cab68b04496e89f555f1e8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>