[coreboot] Universal Payload

[Maximilian Brune]

A few months ago the topic was already in Leadership meeting + Mailinglist.
It is about creating a spec that specifies the handoff between coreboot and
payload via FDT. It is not just for coreboot though (u-boot, oreboot and
EDK2 as well). Its been a while now, the spec grew and I don't want to keep
the community in the dark.
For more information here is the spec:
https://docs.google.com/document/d/1WxEUlCsXpc17DkJhL3XVkOW7e_KIt_zcc9tQ1trO...

Feel free to review (do your worst so that we get something decent),
contribute and enter the meeting that is going on every week:
https://meet.google.com/gha-shza-wnw

greetings
Max