Change in coreboot[master]: mb/google/brya: Add companion device name to WWAN PCIe generic device

[Cliff Huang (Code Review)]

Attention is currently required from: Bora Guvendik, Selma Bensaid, Tim Wawrzynczak, Nick Vaccaro.
Cliff Huang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62330 )

Change subject: mb/google/brya: Add companion device name to WWAN PCIe generic device
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Patch Set 10:

(1 comment)

File src/mainboard/google/brya/variants/brya0/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/62330/comment/46a25949_774d04c3 
PS10, Line 213: rp6_wwan
> Is there additional work needed for this CL?  If not, can we resolve this comment so that this CL ca […]

The recent merged changes for dmaProperty create _DSD, while the changes in this code review and https://review.coreboot.org/c/coreboot/+/62301 are use PCIe generic to create _DSD. This needs to be resolved.