Merge tag 'efi-2023-04-rc1-3' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request efi-2023-04-rc1-3

Documentation:

* Improve the sl-mx8mm documenation
* Clean up README, move some section to HTML
* Man-pages for the mtime and sleep command
* Description of reducible builds
* Document dynamic event handlers

UEFI:

* Support scrolling in eficonfig command

Other:

* fix mtest on 64 bit systems