Merge "Revert "Set overlayable for CarsystemUI NavBar"" into rvc-dev am: 7315e30e95 am: 9bc82c1a12

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

Change-Id: Id35a67e15e16386faf5c56f9faaae434fa12d789