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

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

Change-Id: Ic1ba2afd7e12f778d433f3cf23cdda3dd468187e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>