fs: Record loaded files in an ad-hoc bootflow

This makes a start on dealing with images loaded outside the context of
bootstd. For now, it just records these images. They can be listed using
the 'bootstd images' command.

Often, very little is known about these images, but future work could
perhaps use the filename or contents to detect the type.

Signed-off-by: Simon Glass <sjg@chromium.org>
3 files changed