Merge "Revert "Set overlayable for CarsystemUI NavBar"" into rvc-dev am: 7315e30e am: 9bc82c1a am: a8261bfe

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11886963

Change-Id: I55126d76858355d96c05d2503dd8d1fbb4e0939c