templates/EFI: use files from Ubuntu 18.04
Currently, the shim cannot be loaded with TianoCore (using
/usr/share/edk2.git/ovmf-x64/OVMF-pure-efi.fd from
https://www.kraxel.org/repos/jenkins/edk2/edk2.git-ovmf-x64-0-
20180508.84.g7cd8a57599.noarch.rpm)
and also fails on several systems like on the Dell XPS 13 9360 and 9370,
Dell r640 (see http://ml.grml.org/pipermail/grml/2018-May/011734.html)
and HP EliteBook 820 G3.
Error message during boot:
| Reloc 0 block size
2756420659 is invalid
| Relocation failed: Unsupported