[S] Change in coreboot[main]: soc/intel/cse: Check PSR bit before issuing PSR backup command

[Rizwan Qureshi (Code Review)]

Attention is currently required from: Anil Kumar K, Krishna P Bhat D, Rizwan Qureshi.

Rizwan Qureshi has uploaded a new patch set (#8) to the change originally created by Anil Kumar K. ( https://review.coreboot.org/c/coreboot/+/74874?usp=email )

The following approvals got outdated and were removed: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

Change subject: soc/intel/cse: Check PSR bit before issuing PSR backup command
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soc/intel/cse: Check PSR bit before issuing PSR backup command

Get PSR bit state using MKHI_FWCAPS_GET_FW_FEATURE_STATE HECI command
Use this bit info to check if SKU supports PSR and consequently issue
PSR_HECI_FW_DOWNGRADE_BACKUP command for PSR data backup during
downgrade.

BUG=b:273207144
TEST=build CB image and boot on google/rex board. Check for
"PSR is supported in this SKU" message in coreboot logs to confirm
that PSR bit is set in SKU

Signed-off-by: Anil Kumar 
Change-Id: I6e92341a9dc799146eb8f1a70b3a4a16fd1aa0ae
---
M src/soc/intel/common/block/cse/cse_lite.c
M src/soc/intel/common/block/include/intelblocks/cse.h
2 files changed, 34 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/74/74874/8