[XS] Change in coreboot[main]: payload/external/edk2: Explicitly define the build arch

[Nicholas Sudsgaard (Code Review)]

Attention is currently required from: Benjamin Doron, Lean Sheng Tan, Martin L Roth, Matt DeVillier, Sean Rhodes, Stefan Reinauer.

Nicholas Sudsgaard has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/80883?usp=email )

Change subject: payload/external/edk2: Explicitly define the build arch
......................................................................

Patch Set 2:

(1 comment)

Patchset:

PS1:
> > Without this option, the EDK2 UefiPayloadPkg will not build. […]

I think I should mention that I'm building the `official edk2 repository` using `origin/master`. Using the default `MrChromebox's edk2 fork` builds fine without this patch, as the upstream patch I referred to in the commit message was only added a week ago.