[M] Change in coreboot[master]: mb/google/myst: Add ACPI configuration for USB ports

[Tim Van Patten (Code Review)]

Attention is currently required from: Raul Rangel, Jon Murphy, Paul Menzel, Karthik Ramasubramanian, Mark Hasemeyer.

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74106 )

Change subject: mb/google/myst: Add ACPI configuration for USB ports
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Patch Set 12:

(2 comments)

File src/mainboard/google/myst/variants/baseboard/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/74106/comment/c291f711_206c3960 
PS12, Line 9: 		device ref iommu on end
ref1

https://review.coreboot.org/c/coreboot/+/74106/comment/90573791_05268722 
PS12, Line 89: 	device ref iommu on end
> It is on Skyrim? https://source.corp.google. […]

You have it above already. See `ref1`.