[M] Change in coreboot[master]: mb/google/myst: Add USB config

[Paul Menzel (Code Review)]

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

Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75574?usp=email )

Change subject: mb/google/myst: Add USB config
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/75574/comment/07f43f48_f4f4fa55 :
PS2, Line 9: FSP
In two years, nobody will remember and having to dig through Gerrit comments is going to be very time-consuming. I think,
> … since early-bringup FSP …

would be helpful.

https://review.coreboot.org/c/coreboot/+/75574/comment/5b106c93_88896838 :
PS2, Line 14: verify USB works
> We're still in early bringup.  This enables testing. […]

Maybe you can be more specific: verify hubs and attached USB devices are listed in `lsusb`