Integrate cmd-db into the U-Boot driver model. This is just a wrapper around an in-memory database, so we just need to get the address and validate that cmd-db is there. Since cmd_db_header will be stored in the .data section we can skip bind if it's already set. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>