Add VTS for Watermark APIs am: 17a91907 am: a311d904 am: 80e23c54

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



Change-Id: I52fe2f5f1c9e4354f614089a03f7fcd4c53cd939
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>