Add VTS test for new observe mode command am: f046efb61b am: 1dc6435574

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3467744

Change-Id: I38a50e95858d2c31fb0952b678057db5f49995a4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>