Disable recents button in carmode inside of NavigationBarView,

instead of doing it from PhoneWindowManager, which doesnt maintain
the mUiMode properly and in sync with that in the UiModeManager.
In addition the re-layout / modifications in the content of the
navigation bar in care mode are better consolidated in one place
instead of many places.

Bug: 27313462

Change-Id: I1bdc2324f649f19f879b71c695381587561498e9