Navigation bar dimensions (2/2)

Based off this commit from @cristianomatos, https://github.com/cristianomatos/android_packages_apps_Settings/commit/4f39b54804e303f6cdef1688c103e44577a60ae5
- Modified to work with our current nav bar setup.

Change-Id: I97f16879670a743899655a5fde5958838073b611
Signed-off-by: Lokesh Chamane <lokesh.c703@gmail.com>