Add VTS for Watermark APIs am: 17a9190730

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

Change-Id: I60fa0426cce800fde88d4576ed2e43da0a282b34
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>