Bug#1036948: edk2: please configure a grub menu entry for efi-shell-ARCH

[Pascal Hambourg]

In an attempt to move forward, I opened a draft merge request loosely 
based on Lionel's patch:
<https://salsa.debian.org/qemu-team/edk2/-/merge_requests/15>
For now it is only a PoC limited to x64 and may be extended to other 
platforms if it receives positive feedback from maintainers.