Merge tag 'efi-2019-10-rc4-5' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for v2019.10-rc4 (5)

This patch set fixes errors in the UEFI sub-system and adds a function to
compare u16 strings which is prerequisite for further patches.