[M] Change in libgfxinit[main]: gma: Update DP training with new fields

[Nico Huber (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Jérémy Compostella, Nick Vaccaro, Shelley Chen, Subrata Banik, Tarun Tuli, Tim Wawrzynczak.

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/libgfxinit/+/67490?usp=email )

Change subject: gma: Update DP training with new fields
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Patch Set 24:

(1 comment)

Patchset:

PS23:
> @Nico/Arthur: can you please help to mark V+1 which might help us to land this CL?

See other comments. Basically this change can be abandoned and a better
solution can be integrated into CB:67499. I'm working on that now. I have
TGL hardware at hand and everything up to CB:67500 pieced together on a
local branch. I'll push it when I have it working (hopefully next week).

Some of the ADL work has already been integrated into the TGL patches.
I suggest that we rebase and retest what is left once CB:67500 has landed.

I'll leave this comment open so it's not overlooked.