Change expo_dump() to output object IDs in hex format. This matches the
normal convention in U-Boot.
Also add key_id and preview_id to the menu item dump output while we are
here.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
For debugging it is sometimes helpful to dump an expo. Add an
implementation of this, writing to a membuf.
Add a MAINTAINERS entry for expo, including this next file.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>