SystemUI: make LinearColorBar themeable[Rambar]

Move colors to resources and use them instead.

Change-Id: If7b8af376da5c17e73e7f33e0c4cb5700e175909
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>

Conflicts:

	packages/SystemUI/res/values-land/pa_dimens.xml