[M] Change in coreboot[master]: intelblocks/cse: Add functions to check and change PTT state

[Michał Żygowski (Code Review)]

Attention is currently required from: Michał Żygowski.

Hello build bot (Jenkins), Michał Kopeć,

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

https://review.coreboot.org/c/coreboot/+/68919

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

Change subject: intelblocks/cse: Add functions to check and change PTT state
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intelblocks/cse: Add functions to check and change PTT state

Add functions that allow checking and changing PTT state at runtime.
Can be useful for platforms that want to use dTPM instead and have no
means to stitch ME firmware binary with disabled PTT.

The changing function also checks for the current feature states via
HECI to ensure that the feature state will not be changed if not
needed.

TEST=Successfully switch to dTPM on Comet Lake i5-10210U SoC.

Signed-off-by: Michał Żygowski 
Change-Id: I8426c46eada2d503d6ee72324c5d0025da3f2028
---
M src/soc/intel/common/block/cse/cse.c
M src/soc/intel/common/block/include/intelblocks/cse.h
2 files changed, 196 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/19/68919/2