[XS] Change in coreboot[main]: soc/intel/pantherlake: Adjust IGD stolen memory size

[Paul Menzel (Code Review)]

Attention is currently required from: Avi Uday, Intel coreboot Reviewers, Jayvik Desai, Kapil Porwal, Pranava Y N, Subrata Banik.

Paul Menzel has posted comments on this change by Subrata Banik. ( https://review.coreboot.org/c/coreboot/+/87460?usp=email )

Change subject: soc/intel/pantherlake: Adjust IGD stolen memory size
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Patch Set 1:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/87460/comment/599cfe6d_d4a315c9?usp... :
PS1, Line 7: Adjust IGD stolen memory size
           : 
Maybe more specific:
> Decrease IGD stolen memory size from 128 MB to 60 MB

https://review.coreboot.org/c/coreboot/+/87460/comment/f9fbe33d_5587be86?usp... :
PS1, Line 9: This commit updates the pre-allocated IGD stolen memory size
           : for Intel Panther Lake SoCs from 128MB to 60MB within the
           : FSP-M configuration parameters.
Why? Maybe start by stating the problem like graphics not working, and also why 60 MB is the chosen value.