[S] Change in coreboot[master]: soc/amd/mendocino: Set up SoC-specific XHCI defines

[Robert Zieba (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Matt DeVillier, Angel Pons, Martin Roth, Fred Reitberger, Karthik Ramasubramanian, Felix Held.

Robert Zieba has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67938 )

Change subject: soc/amd/mendocino: Set up SoC-specific XHCI defines
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Patch Set 10:

(4 comments)

File src/soc/amd/mendocino/Kconfig:

https://review.coreboot.org/c/coreboot/+/67938/comment/4738bfd1_7202fe7c 
PS7, Line 51: 	select SMM_PCI_BAR_STORE
> Put this in the amd/common XHCI Kconfig?

Done

File src/soc/amd/mendocino/xhci.c:

PS7:
> Different CL please

Done

File src/soc/amd/mendocino/xhci_elog.c:

https://review.coreboot.org/c/coreboot/+/67938/comment/353c661a_6dd8d7f0 
PS7, Line 6:
> Does this need to be a struct that's defined in a C file?  The preference for these sorts of things  […]

`DEV_PTR` can't be used to initialize static structs so I've restructured the code to use defines instead.

https://review.coreboot.org/c/coreboot/+/67938/comment/b385a9a1_3bb17971 
PS7, Line 9: .usb2_port_status_reg = 0x420,
           : 		.num_usb2_ports = 2,
           : 		.usb3_port_status_reg = 0x440,
           : 		.num_usb3_ports = 1
> Why the magic numbers? We can use the functions in https://source.chromium. […]

Done