The DTB for Clearfog Pro has been renamed in mainline. However U-Boot
hasn't picked up that change yet :(, so we need to hardcode it for now.
Signed-off-by: Josua Mayer <josua.mayer97@gmail.com>
Unify boot.scr generation so Makefile for device image generation won't
grow without a reason. Also make boot-scr step optional.
Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>