Merge "Lock ATV UI mode to prevent Car Mode tests from running + failing" into rvc-dev am: 685aa0c201 am: 43dab61610 am: 89ea60f3ce

Original change: https://googleplex-android-review.googlesource.com/c/device/google/atv/+/11757266

Change-Id: If9a95463181171e542c6100bbd5239d141677d44