[S] Change in coreboot[master]: soc/amd/phoenix/include/xhci: add USB4 XHCI device pointers

[Felix Held (Code Review)]

Attention is currently required from: Robert Zieba, Jason Glenesk, Matt DeVillier, Martin Roth, Fred Reitberger, Karthik Ramasubramanian.

Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74658 )

Change subject: soc/amd/phoenix/include/xhci: add USB4 XHCI device pointers
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Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/74658/comment/5cbd03b1_57880b21 
PS2, Line 9: Beware that there's no XHCI2 controller and the USB4 controller device
           : pointers were added right after the xhci_0 and xhci_1 controller device
           : pointers.
> Definitely agree with Martin. […]

ah, ok, wasn't sure about this requirement of the xhci pci code; pinged Robert to look into that. do yo uhave any suggestions for the comments? is adding add a /* XHCI3 */ comment to the #define SOC_XHCI_2 DEV_PTR(usb4_xhci_0) sufficient? same for the next one