Documentation: Add tutorial for me_cleaner on Lenovo devices

Add a tutorial how to use ME cleaner, and give some basic steps to
strip the ME. Update the Lenovo Sandy Bridge documentation that no
issues could be observed on X220 and give an example flash layout.

Tested on Lenovo X220 with stripped ME and found no issues:
commit: cbc5b99ac9e5856631109b1e7f20e80799beb1e4

* Displayport
* VGA
* USB
* Bluetooth
* Wifi
* Wifi-kill switch
* libgfxinit
* SATA
* Audio
* SD-card
* Ethernet
* Keyboard
* Fn-Keys
* Display brightness
* ACPI S3 resume
* Battery events
* CPU temperature reporting
* FAN managment
* Stress test stable
  * Youtube videos over Wifi
  * stress -c 2 -m 1 -d 1
  * glxgears

Change-Id: I0b1d04f00b5dbb38cf04333f2b345749b740a375
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39129
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 74 insertions, 0 deletions

diff --git a/Documentation/mainboard/lenovo/flashlayout_Sandy_Bridge_stripped_me.svg b/Documentation/mainboard/lenovo/flashlayout_Sandy_Bridge_stripped_me.svg
new file mode 100644
index 0000000000..d8d8213d12
--- /dev/null
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