Merge tag 'efi-2019-10-rc4-3' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Merge tag 'efi-2019-10-rc4-3' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for v2019.10-rc4 (3)

This includes the patches from
Pull request for UEFI sub-system for v2019.10-rc4 (2)

Fix UEFI specification compliance issues in the simple network protocol:

* Correctly set and reset the interrupt status.
* Support filling the header in the Transmit() service.
* Correct the checking and setting of the network state.
* Implement the MCastIPtoMAC() service.
* Adjust the simple network protocol unit test.

Fix UEFI specification compliance issues in the protocol.

Fix UEFI specification compliance issues in the simple text output protocol:
* Avoid out of bounds cursor position.
* Do not set illegal screen mode.

Fix UEFI specification compliance issues in the  block IO protocol:
* Check parameters.
* Return correct status code if buffer is unaligned.

Refactor initialization of EFI memory in preparation of support for
> 3GB memory on x86.