Merge tag 'efi-2021-07-rc5-2' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2021-07-rc5-2

Documentation:

* man-page for askenv

bug fixes

* correct display of BootOrder in efidebug command
* do not allow TPL_HIGH_LEVEL for CreateEvent(Ex)
* correct handling of unknown properties in SMBIOS tables