Rework the nav bar dimension/enable (1/3)

Current setup wasn't working properly for devices without HW keys.

Revert/Disable "Runtime toggle of navbar", I left the code there
so that it won't screw us up in the future when we're receiving commits
related to it.

--------------------------------
Revert "Runtime toggle of navbar"

This reverts commit b6a1eb3bd5438906f06a076a7c29d97376638496.
--------------------------------

Change-Id: I26fbc8c2713f5b8a5f701536ce2cf3c722110402
Signed-off-by: Lokesh Chamane <lokesh.c703@gmail.com>