Stop depending on the current mkimage method of generating the FSPI header, instead generate the FSPI header within binman itself. This is more flexible, as the FSPI header properties can be configured from within the board-specific DT instead of being hard-coded in mkimage at build time. Acked-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Marek Vasut <marex@nabladev.com> Reviewed-by: Simon Glass <sjg@chromium.org>