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

[Matt DeVillier (Code Review)]

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

Matt DeVillier 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
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Patch Set 2:

(1 comment)

Patchset:

PS1:
> I think I should mention that I'm building the `official edk2 repository` using `origin/master`. […]

if this breaks building UniversalPayload for Sean, then perhaps this addition needs to be moved inside one of the if EDK2_PAYLOAD_UEFIPAYLOAD guards above