Change in flashrom[master]: Add Elkhart Lake support

[Werner Zeh (Code Review)]

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Hello build bot (Jenkins), Nico Huber,

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

https://review.coreboot.org/c/flashrom/+/60711

to look at the new patch set (#3).

Change subject: Add Elkhart Lake support
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Add Elkhart Lake support

Elkhart Lake has a chipset called Mule Creek Canyon which is quite
compatible with 300 series chipsets. There are a few differences though,
e.g. different encoding for the SPI clock values for read and write in
the FLCOMP register. In addition Elkhart Lake has a new PCI device ID
for the SPI controller which is added, too.

TEST=Read and flash complete flash on Siemens MC EHL1

Change-Id: I711e39a3ec9cd7098389231eaa1cb864d615a475
Signed-off-by: Werner Zeh 
---
M chipset_enable.c
M ich_descriptors.c
M ichspi.c
M programmer.h
M util/ich_descriptors_tool/ich_descriptors_tool.c
5 files changed, 47 insertions(+), 6 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/11/60711/3