[XS] Change in coreboot[main]: mb/google/fatcat: Disable package c-state auto-demotion

[Subrata Banik (Code Review)]

Attention is currently required from: Pranava Y N, Sukumar Ghorai.

Subrata Banik has posted comments on this change by Sukumar Ghorai. ( https://review.coreboot.org/c/coreboot/+/84956?usp=email )

Change subject: mb/google/fatcat: Disable package c-state auto-demotion
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Patch Set 1:

(2 comments)

File src/mainboard/google/fatcat/variants/baseboard/fatcat/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/84956/comment/449086e1_38352ab8?usp... :
PS1, Line 42: demotion
nit:

auto-demotion

https://review.coreboot.org/c/coreboot/+/84956/comment/63de2e24_f633b961?usp... :
PS1, Line 43: register "disable_package_c_state_demotion" = "true"
initially when this was implemented in ADL, I thought this is a W/A and we won't need this in future soc, but looks like this is now a new norm ?

description from Brya platform
```
    # Disable package C state demotion on Raptorlake as a W/A for S0ix issues
    # seen on J0 and Q0 SKUs
```