Merge tag 'efi-2021-07-rc1' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2021-07-rc1

Bug fixes:

* support EFI, HOST, VIRTIO in fsinfo command
* simplify efi_get_device_path_text()
* add missing EFI_UNACCEPTED_MEMORY_TYPE
* mkeficapsule: improve online help
* avoid several build warnings

Documentation:

* UEFI documentation for initrd loading options
* describe building OP-TEE with for UEFI variables
* mmc man-page