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

[Furquan Shaikh (Code Review)]

Attention is currently required from: Martin Roth, Marshall Dawson, Subrata Banik, Nikolai Vyssotski, Andrey Petrov, Patrick Rudolph, Nathaniel L Desimone.
Furquan Shaikh 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 2:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/56190/comment/460aad26_3240056c 
PS2, Line 13:  however, some FSP 2.0 variants have it as well.
Thanks for the pointers Nick.
> The other option is to override this header file during FSP build but per discussion with Martin it seems to be a less desirable approach.

Why is it less desirable approach?

+Nate, +Subrata - do you know why FSP Header spec version wasn't updated as part of https://github.com/tianocore/edk2/commit/f2cdb268ef04eeec51948b5d81eeca5cab5... Is the intention here that the PcdFspHeaderSpecVersion be overriden by the FSP package? I see that is what TGL is doing for example in `TigerLakeFspPkg.dsc`