Merge tag 'efi-2021-10-rc4' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2021-10-rc4

Documentation:

    Remove invalid reference to configuration variable in UEFI doc

UEFI:

    Parameter checks for the EFI_TCG2_PROTOCOL
    Improve support of preseeding UEFI variables.
    Correct the calculation of the size of loaded images.
    Allow for UEFI images with zero VirtualSize