[S] Change in coreboot[master]: mb/google/myst: Enable PCIe devices in devicetree

[Tim Van Patten (Code Review)]

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

Tim Van Patten has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74112 )

Change subject: mb/google/myst: Enable PCIe devices in devicetree
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Patch Set 8:

(2 comments)

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

https://review.coreboot.org/c/coreboot/+/74112/comment/ee45606d_34db35ee 
PS8, Line 43: 	device domain 0 on
Do we need `device ref iommu on end` so we can access these devices through the IOMMU?

https://review.coreboot.org/c/coreboot/+/74112/comment/7e046667_d04783b9 
PS8, Line 52: 		device ref gpp_bridge_2_4 on end # NVMe
I'm not an expert here. Why are these `bridge_2_1`, `bridge_2_2`, etc., rather than just `bridge_1`, `bridge_2`, etc.?