Merge tag 'efi-2021-01-rc2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2021-01-rc2

A software RTC driver is supplied for UEFI SCT testing.

The following UEFI related bugs are fixed:

* correct handling of daylight saving time in GetTime() and SetTime()
* handling of the gd register in function tracing on RISC-V
* disable U-Boot devices in ExitBootServices()