[S] Change in coreboot[main]: soc/intel/cmn/pmc: Add support for early power off

[Angel Pons (Code Review)]

Attention is currently required from: Intel coreboot Reviewers, Julius Werner, Karthik Ramasubramanian, Subrata Banik.

Angel Pons has posted comments on this change by Subrata Banik. ( https://review.coreboot.org/c/coreboot/+/86336?usp=email )

Change subject: soc/intel/cmn/pmc: Add support for early power off
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Patch Set 2:

(2 comments)

Patchset:

PS2: 
AIUI, the problem here is that the PCH doesn't want to power off in early stages, so the workaround is to tell the EC (in this case, chromeec) to power off the platform instead

Commit Message:

https://review.coreboot.org/c/coreboot/+/86336/comment/5b60ff63_58eac637?usp... :
PS2, Line 10: alongwith 
nit: along with