Move status bar to CarNavigationBar

This also allows us to remove CarStatusBar.java (note that
CarStatusBar.java may still be instantiated via injection into other
Phone SysUI dependencies).

Bug: 147455109
Test: manual, atest CarNavigationBarTest CarNavigationBarControllerTest
Change-Id: Ic9f40c0662ae4ab3195f71ecebe91ba5cf2a7b22