[S] Change in coreboot[main]: soc/intel/mtl: Hook up GMA ACPI brightness controls

[Dinesh Gehlot (Code Review)]

Attention is currently required from: Eran Mitrani, Jakub Czapiga, Kapil Porwal, Subrata Banik, Tarun, Tim Crawford.

Dinesh Gehlot has posted comments on this change by Tim Crawford. ( https://review.coreboot.org/c/coreboot/+/82729?usp=email )

Change subject: soc/intel/mtl: Hook up GMA ACPI brightness controls
......................................................................

Patch Set 2:

(1 comment)

File src/soc/intel/meteorlake/Kconfig:

https://review.coreboot.org/c/coreboot/+/82729/comment/76098397_a501cf46?usp... :
PS2, Line 398: INTEL_GMA_BCLV_OFFSET
I'm curious, where exactly are these backlight offset configs used? Are there any subsequent changes planned?