Merge tag 'efi-2022-01-rc2' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2022-01-rc2

Documentation:
* improve description of mmc rescan
* remove obsolete PPC documenation

UEFI
* Provide unit test for the EFI_TCG2_PROTOCOL
* Implement add EFI_TCG2_PROTOCOL.SubmitCommand
* Start the implementation of a 64 bit EFI app
* Reduce rcar3_salvator-x image size