[M] Change in libgfxinit[main]: gma pipe_setup: Update for TGL & ADL

[Angel Pons (Code Review)]

Attention is currently required from: Dinesh Gehlot, Jérémy Compostella, Nick Vaccaro, Nico Huber, Tarun Tuli, Tim Wawrzynczak.

Angel Pons has posted comments on this change by Tim Wawrzynczak. ( https://review.coreboot.org/c/libgfxinit/+/67494?usp=email )

Change subject: gma pipe_setup: Update for TGL & ADL
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Patch Set 35:

(1 comment)

File common/hw-gfx-gma-pipe_setup.adb:

https://review.coreboot.org/c/libgfxinit/+/67494/comment/0ecdc807_b45df464?u... :
PS32, Line 354:          if Config.Has_New_Mbus_Dbox_Credits then
> I doubt we have that. I couldn't find much about it, but it's something that i915 […]

Hmmm, yeah, seems like it's for hi-BW situations. I don't mind, choose whichever approach works best for you.