[XS] Change in coreboot[main]: mb/google/nissa/var/sundance: disable pcie port7

[Roger Wang (Code Review)]

Attention is currently required from: Derek Huang, Dinesh Gehlot, Felix Held, Kapil Porwal, Nick Vaccaro, Paul Menzel, Shou-Chieh Hsu, Subrata Banik.

Roger Wang has posted comments on this change by Roger Wang. ( https://review.coreboot.org/c/coreboot/+/83057?usp=email )

Change subject: mb/google/nissa/var/sundance: disable pcie port7
......................................................................

Patch Set 3:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/83057/comment/6cd923dc_6700a3e1?usp... :
PS3, Line 225: pcie_rp7
> did you already consider configuring the HSIO to ensure RP7 is actually disable using MFIT?

No, we don't have any devices attached to RP7 and we already configure disable on MFIT.