Copy the image and U-Boot rom when using overlays.

Since bitbake can remove old images that an overlay was non-obviously
dependent on, the safest thing to do is make a copy of the image and
keep it alongside the overlay. When using the overlay later,
automatically use that image. Also do the same thing with the U-Boot
rom. This should also make moving the overlay file to another machine
much easier.

Signed-off-by: Patrick Vacek <patrickvacek@gmail.com>

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