Change in coreboot[master]: soc/amd/cezanne/acpi/mmio: Add support for shared I2C3 controller

[Jan Dabros (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Paul Menzel, Karthikeyan Ramasubramanian, Felix Held.
Jan Dabros has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61863 )

Change subject: soc/amd/cezanne/acpi/mmio: Add support for shared I2C3 controller
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Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/61863/comment/6ab6aa90_f4ca2628 
PS2, Line 10: In order to handle this, PSP acts as an
            : I2C-arbitrator, where x86(kernel) sends acquire and release requests to
            : be accepted by PSP.
> Is that documented in some datasheet? Please document the name and revision.

Actually it is not documented in any datasheet. Does this makes sense to put a link to commit (linux-next repo) with this functionality implemented?