Change in coreboot[master]: mb/google/nissa/var/nivviks: Add TcssAuxori for nivviks

[Reka Norman (Code Review)]

Attention is currently required from: Kangheui Won, Paul Menzel, Tim Wawrzynczak, Usha P.
Reka Norman has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62731 )

Change subject: mb/google/nissa/var/nivviks: Add TcssAuxori for nivviks
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Patch Set 2:

(1 comment)

File src/mainboard/google/brya/variants/nivviks/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/62731/comment/ee317ac5_cdad0d73 
PS2, Line 12: 	register "TcssAuxOri" = "5"
> +1. Even better if you can also add some information as comments.

There's an explanation of the bitfield here: https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/heads/master/src...

So I assume the 5 is because we don't have external retimers for ports C0 and C1? But yes, I agree a comment in the code would be nice.