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

[Anil Kumar K (Code Review)]

Hello build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/74874?usp=email

to look at the new patch set (#6).

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

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, 25 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/74/74874/6