key event focus logic should support large tablets

TL;DR;; On smaller tablets, landscape = vertical hotseat bar, and
portrait = horizontal hotseat bar. However, in larger tablets, hotseat bar is
always horizontal. This is now correctly handled using DeviceProfile.isVerticalBar
method.

b/19732584

Change-Id: I1035c89b4685be12dbc863f8a1465047a5fec6a6