[XS] Change in libgfxinit[cros]: gma tgl: Pcode CDCLK_PREPARE_FOR_CHANGE is not mandatory

[Dinesh Gehlot (Code Review)]

Attention is currently required from: Angel Pons, Anil Kumar K, Jérémy Compostella.

Dinesh Gehlot has posted comments on this change. ( https://review.coreboot.org/c/libgfxinit/+/82147?usp=email )

Change subject: gma tgl: Pcode CDCLK_PREPARE_FOR_CHANGE is not mandatory
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Patch Set 4: Verified+1

(2 comments)

Commit Message:

https://review.coreboot.org/c/libgfxinit/+/82147/comment/8edc9a11_16c6183f :
PS2, Line 10: BIOS Reset CPL and may fail when called too early.
> Would be nice to mention this in the commit message

Acknowledged

File common/tigerlake/hw-gfx-gma-power_and_clocks.adb:

https://review.coreboot.org/c/libgfxinit/+/82147/comment/b4eae5e6_a6972ee1 :
PS4, Line 331: not Config.CPU_Alderlake
> Would be nice to turn this into a dedicated config variable.

Acknowledged! Added a dedicated config in a subsequent change [CL-82258](https://review.coreboot.org/c/libgfxinit/+/82258/1)