Merge branch '2024-07-05-assorted-updates'

- Re-instate the zlib update, so we can fix it for this release,
  assorted whitespace cleanups, allow mkimage to 'auto-conf' signing of
  scripts, enhance ELF image support, add more HW rev support to e1000
  driver, update am64x_evm config, correct mpc8xxx watchdog, update
  phycore-am6 docs.