Merge tag 'efi-2020-01-rc1-2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-01-rc1 (2)

Install the simple file protocol only if there is a file system on the
partition.

Enable CONFIG_CMD_NVEDIT_EFI on QEMU.