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

[Subrata Banik (Code Review)]

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

Hello Intel coreboot Reviewers, Julius Werner, Karthik Ramasubramanian, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/86336?usp=email

to look at the new patch set (#2).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: soc/intel/cmn/pmc: Add support for early power off
......................................................................

soc/intel/cmn/pmc: Add support for early power off

This commit adds support for early power off on Intel platforms
alongwith existing PMC based implementation to support power off
at later stage (like ramsatge).

A new function, `platform_do_early_poweroff`, is added to the
pmclib to handle platform-specific early power off procedures.
This function is called before memory initialization (in romstage or
earlier).

A weak default implementation is provided which prints an error message
and halts the system if EC_GOOGLE_CHROMEEC Kconfig not present.
Otherwise call into `google_chromeec_do_early_poweroff` to power off
the platform.

BUG=b:339673254
TEST=Able to build and boot google/brox.

Change-Id: I39f516640b3f75ab4c6a09826922289c0533f79b
Signed-off-by: Subrata Banik 
---
M src/soc/intel/common/block/include/intelblocks/pmclib.h
M src/soc/intel/common/block/pmc/pmclib.c
2 files changed, 39 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/36/86336/2