[S] Change in flashrom[main]: ichspi: Add RaptorPoint PCH support

[Michał Żygowski (Code Review)]

Attention is currently required from: Krystian Hebel, Maciej Pijanowski, Michał Kopeć, Sergii Dmytruk.

Michał Żygowski has uploaded a new patch set (#4) to the change originally created by Maciej Pijanowski. ( https://review.coreboot.org/c/flashrom/+/83854?usp=email )

The following approvals got outdated and were removed: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

Change subject: ichspi: Add RaptorPoint PCH support
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ichspi: Add RaptorPoint PCH support

Based on public Intel 700 Series PCH datasheet, DOC 743835 rev 004.

TEST=Probe flash on Z790 chipset

Change-Id: I13ac52d5400c0e2260e12d605077fc2182c379ef
Signed-off-by: Michał Żygowski 
---
M chipset_enable.c
M doc/release_notes/devel.rst
M ich_descriptors.c
M ichspi.c
M include/programmer.h
M util/ich_descriptors_tool/ich_descriptors_tool.c
6 files changed, 45 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/54/83854/4