SystemUI: Vector drawables for data activity resources

Also include a transparent 'no activity' version to avoid
relayout requests of the ImageView because of size changes.

Change-Id: I0aee41f145b946c79c6bbb2a21954259ebd5f873
PhoneWindowmanager: disable panic mechanism when PolicyControl activated.

Change-Id: I5cf5f681237bbd17ec0fe2d041dd782cfb4b72f0