Revert "Buttons: Allow disabling hard navigation keys"

This reverts commit fa000453dce8936ee6805c8d953f3ab8d42f2b21.

Change-Id: I8f8fb345d54068df3bcf68f2e24442bf65f370d4
Navigation bar dimensions (2/2)

- Change height when in portrait
- Change width when in landscape
- Option to enable or disable nav bar

This is partially ported from SlimRoms
Thanks to @kufikugel

Change-Id: Icac45d5c74f1722c1d044c6651ea686e95beade4