Merge tag 'efi-2019-10-rc3' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for v2019.10-rc3

This pull request provides corrections for the SetVirtualAddress runtime
service and avoids possible calls to NULL by consumers of the
EFI_PXE_BASE_CODE_PROTOCOL.