Merge tag 'efi-2021-04-rc3-3' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2021-04-rc3-3

New:

* Provide library functions for converting UTF-8 streams either to code
  page 437 or Unicode code points.

Bug fixes:

* Fix the capsule update unit tests.
* Use the terminal size of the video console if it is the primary output.