Add VTS for Watermark APIs am: 17a91907 am: a311d904 am: c53bf351

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



Change-Id: I7f414703d14b48986da22d77cc7378a968553a68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>