[XS] Change in coreboot[master]: mb/google/myst: Add PCIe shutdown workaround

[Tim Van Patten (Code Review)]

Attention is currently required from: Eric Lai, Jon Murphy, Karthik Ramasubramanian, Martin Roth.

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75583?usp=email )

Change subject: mb/google/myst: Add PCIe shutdown workaround
......................................................................

Patch Set 3:

(1 comment)

File src/mainboard/google/myst/port_descriptors.c:

https://review.coreboot.org/c/coreboot/+/75583/comment/6869edfb_3c7a8633 :
PS2, Line 56: 	.turn_off_unused_lanes = true,
> This is a workaround and it's working.  We have a bug to track getting it fixed. […]

What are the differences between the two in terms of unintended side effects? My preference would be to make changes that are as specific as possible, to reduce introducing unrelated behavior changes that could take additional time to debug.