Add a DebugMetadata helper to the context and add the corresponding plumbing. This is all that is needed to support debug metadata in an IPA. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>