Add VTS for Watermark APIs am: 17a9190730 am: bed48cb485 am: a3c24c1f29

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

Change-Id: I1a70a8865a826a00c6e96f5f60a4968141d882b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>