Change in flashrom[master]: Add Tiger Lake U Premium support

[Michał Żygowski (Code Review)]

Attention is currently required from: Tim Crawford, Michał Żygowski.
Hello Tim Crawford, build bot (Jenkins), Nico Huber, Angel Pons,

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

https://review.coreboot.org/c/flashrom/+/55578

to look at the new patch set (#13).

Change subject: Add Tiger Lake U Premium support
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Add Tiger Lake U Premium support

Tiger Lake has very low ICCRIBA (TGL=0x11, CNL=0x34 and CML=0x34) and
detects as unknown chipset compatible with 300 series chipset. Add a
new enum CHIPSET_500_SERIES_TIGER_POINT and treat it identically to
CHIPSET_400_SERIES_COMET_POINT. There are some exceptions though,
ICCRIBA is no longer present n descriptor content so a new union has
been defined for new fields and used in descriptor guessing.
freq_read field is not present on Tiger Lake, moreover in CannonPoint
and Comet Point this field is used as eSPI/EC frequency, so a new
function to print read frequency has ben added. Finally Tiger lake
boot straps include eSPI, so a new bus has been added for the new
straps.

TEST=Flash BIOS region on Intel i5-1135G7

Signed-off-by: Michał Żygowski 
Change-Id: I28f3b6fe9f8ce9e976a6808683f46b6f4ec72bdd
---
M chipset_enable.c
M ich_descriptors.c
M ich_descriptors.h
M ichspi.c
M programmer.h
M util/ich_descriptors_tool/ich_descriptors_tool.c
6 files changed, 91 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/78/55578/13