At present this is only used on ARM and sandbox, but it is just as
applicable to other architectures. Move the function prototype into the
generic SPL header.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Add an sandbox implementation for the generic SPL framework. This supports
locating and running U-Boot proper.
Signed-off-by: Simon Glass <sjg@chromium.org>