NavigationBar : Only inflate once

Since the navbar now has updateResources(), there is no need to reinflate
it upon a theme change.

Change-Id: Ie4753a767a1cb45eb459ee692d16067f83cc7d23
Merge "NavigationBar : Only inflate once" into cm-10.1
Merge branch 'cm-10.1' of https://github.com/CyanogenMod/android_frameworks_base into linaro