[M] Change in coreboot[master]: cpu/intel/sandybridge: Add `hyper_threading` option

[Evgeny Zinoviev (Code Review)]

Attention is currently required from: Nico Huber, Evgeny Zinoviev.

Evgeny Zinoviev has uploaded a new patch set (#17) to the change originally created by Nico Huber. ( https://review.coreboot.org/c/coreboot/+/29669 )

Change subject: cpu/intel/sandybridge: Add `hyper_threading` option
......................................................................

cpu/intel/sandybridge: Add `hyper_threading` option

More and more people request an option to disable HT. To implement that
we have to toggle a bit in a `soft reset` register in the PCH that can
override certain default settings of the CPU when it comes out of reset.

The `soft reset` register is already used for other settings. So we have
to take care that all settings are gathered before we issue the reset.

Note, the current code using `soft reset` for flex ratio selection seems
incomplete.

Tested on ThinkPad X220 (i5-2520M) and ThinkPad W530 (i7-3940XM).

Change-Id: I2b73e32ff5af8ea64a47e8aa706e27648aaf0993
Signed-off-by: Nico Huber 
Signed-off-by: Evgeny Zinoviev 
---
M src/cpu/intel/model_206ax/bootblock.c
M src/mainboard/lenovo/l520/cmos.default
M src/mainboard/lenovo/l520/cmos.layout
M src/mainboard/lenovo/t420/cmos.default
M src/mainboard/lenovo/t420/cmos.layout
M src/mainboard/lenovo/t420s/cmos.default
M src/mainboard/lenovo/t420s/cmos.layout
M src/mainboard/lenovo/t430/cmos.default
M src/mainboard/lenovo/t430/cmos.layout
M src/mainboard/lenovo/t430s/cmos.default
M src/mainboard/lenovo/t430s/cmos.layout
M src/mainboard/lenovo/t520/cmos.default
M src/mainboard/lenovo/t520/cmos.layout
M src/mainboard/lenovo/t530/cmos.default
M src/mainboard/lenovo/t530/cmos.layout
M src/mainboard/lenovo/x1_carbon_gen1/cmos.default
M src/mainboard/lenovo/x1_carbon_gen1/cmos.layout
M src/mainboard/lenovo/x220/cmos.default
M src/mainboard/lenovo/x220/cmos.layout
M src/mainboard/lenovo/x230/cmos.default
M src/mainboard/lenovo/x230/cmos.layout
M src/southbridge/intel/bd82x6x/pch.h
22 files changed, 123 insertions(+), 19 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/69/29669/17