Change in coreboot[master]: soc/intel/alderlake: Update TCSS PM flow

[Furquan Shaikh (Code Review)]

Attention is currently required from: John Zhao, Sugnan Prabhu S, Tim Wawrzynczak, Subrata Banik, Patrick Rudolph.
Furquan Shaikh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51828 )

Change subject: soc/intel/alderlake: Update TCSS PM flow
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Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/51828/comment/6c3d87d9_3e9e673e 
PS1, Line 9: There is requirement to change PM flow for S0ix along with TBT firmware
           : update under device attached and no device attached scenarios
> Literally as described in b/158777291, this change is to replicate resolution for ADL as what had be […]

I looked through the bug, but unfortunately, it is still not clear to me what the requirement is. Can you please point me to the document that has more details about this?