Merge "Revert "Set overlayable for CarsystemUI NavBar"" into rvc-dev am: 7315e30e95 am: 7a17a51c47

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

Change-Id: I920200f8e2e2ab30d25bf324a81bf2fbf78f13dd