NavigationBar: Custom height (1/2)

Patchset 3 : Fix default value derp
Patchset 4 : Fix custom height during landscape

Change-Id: I61aef192ac658f54f86b87d18cce9d7b073004e2

Forward Port from cm10, patch was originaly abandoned, but it still
lives!

Signed-off-by:  Paul Beeler <sparksco@gmail.com>

Thanks to @pbeeler for all his work

Conflicts:

	core/java/android/provider/Settings.java