Merge tag 'efi-2023-04-rc3' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2023-04-rc3

Documentation

* Add a document for the RISC-V architecture
* Move gateworks and bcm7xxx documentation to HTML

UEFI

* measure the loaded device-tree
* make CapsuleMax configurable and provide sensible default