Change in coreboot[master]: src/drivers/intel/fsp2_0: allow larger FSP 2.0 header

[Michał Żygowski (Code Review)]

Attention is currently required from: Martin Roth, Furquan Shaikh, Marshall Dawson, Subrata Banik, Nikolai Vyssotski, Andrey Petrov, Patrick Rudolph, Nathaniel L Desimone.
Michał Żygowski has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56190 )

Change subject: src/drivers/intel/fsp2_0: allow larger FSP 2.0 header
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Patch Set 3:

(1 comment)

File src/drivers/intel/fsp2_0/include/fsp/info_header.h:

https://review.coreboot.org/c/coreboot/+/56190/comment/b0841718_354acba4 
PS2, Line 13:  however, some FSP 2.0 variants have it as well.
> The FSP header has a length field. […]

The FSP header revision field may also be looked at to check what size to expect. So to safecheck the length doesn't go out of control we may check if the revision does not match expected value in length, simply warn on the console.