Merge tag 'efi-2022-04-rc6' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2022-04-rc6

Documentation:

* Move VxWorks and Plan 9 to HTML documentation
* Move all command man-pages to a separate directory

Test:

* Fix pylint errors

UEFI

* Fix build flags for initrddump.efi

QEMU

* Remove unused function to get RNG device