[S] Change in coreboot[master]: payloads/edk2: Add a recipe to build the ShimLayer

[Martin L Roth (Code Review)]

Attention is currently required from: Sean Rhodes, Stefan Reinauer.

Martin L Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/64485 )

Change subject: payloads/edk2: Add a recipe to build the ShimLayer
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Patch Set 56:

(2 comments)

File payloads/external/edk2/Makefile:

https://review.coreboot.org/c/coreboot/+/64485/comment/937e65bf_576aa389 
PS56, Line 253: 	$(WORKSPACE)/Build/UniversalPayload.elf prep
Nit: indent an extra level to show that this is a continuation of the previous line.

https://review.coreboot.org/c/coreboot/+/64485/comment/5415415e_7c54d555 
PS56, Line 254: ;
change to && instead of ; - this prevents the next commands from running if the 'cd' fails for some reason.  Same on the cd, and possibly for the source commands below.