Merge tag 'efi-2020-10-rc4' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-10-rc4

Bug fixes are provided in the following areas:

* convert file system debug and print messages go log messages
* convert UEFI booting messages to log messages
* UEFI related code clean up and simplification