[XS] Change in coreboot[main]: mb/google/brox/var/jubilant: Set PCIe root port 5 speed to Gen2

[Paul Menzel (Code Review)]

Attention is currently required from: Karthik Ramasubramanian, Ren Kuo.

Paul Menzel has posted comments on this change by Ren Kuo. ( https://review.coreboot.org/c/coreboot/+/85533?usp=email )

The change is no longer submittable: All-Comments-Resolved is unsatisfied now.

Change subject: mb/google/brox/var/jubilant: Set PCIe root port 5 speed to Gen2
......................................................................

Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/85533/comment/a35bb356_bb5bd9ef?usp... :
PS3, Line 9: The decision to set PCIe root port 5 speed to Gen2 is based on experiment setup for b/376156567 and analysis results in comment #86.
           : The setting will fix the issue of Wifi 7 M.2 module doesn't work.
Please reflow for 72 characters per line.