[XS] Change in coreboot[main]: mb/google/brya/var/xol: Disable unused controllers

[Subrata Banik (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eric Lai, Kapil Porwal, Nick Vaccaro, SH Kim.

Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81105?usp=email )

Change subject: mb/google/brya/var/xol: Disable unused controllers
......................................................................

Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/81105/comment/17a7fa9e_ee02183d :
PS1, Line 14: - PCIE RP8
            : - PCIE RP9
> Does softstrap mean mfit config?

Yes
> There is no option to disable PCIE RP in mfit config and we verified the PCIE RPs are disabled properly with only this CL as described in the bug.

You can configure the PCIe RP lanes such a way that, RP8 and RP9 are not enabled (something like for RP8/1x4)