To abstract the way a platform reasons about which DTB is appropriate, and the way it ultimately supplies the DTB image, introduce a new library class to encapsulate this functionality. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>