[M] Change in coreboot[master]: soc/amd/common/xhci: Add support for logging XHCI wake events

[Angel Pons (Code Review)]

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

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67936 )

Change subject: soc/amd/common/xhci: Add support for logging XHCI wake events
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Patch Set 10:

(1 comment)

File src/soc/amd/common/block/include/amdblocks/xhci.h:

https://review.coreboot.org/c/coreboot/+/67936/comment/fdd0cdc8_e4783ea6 
PS7, Line 19: #if CONFIG(SOC_AMD_COMMON_BLOCK_XHCI_ELOG) && ENV_SMM
> We shouldn't ever need to hide the declarations this way.

It's best to rely on the linker optimizing away unreachable function calls. The only reason we have this pattern elsewhere is for optional functionality where calls aren't guarded, e.g. console drivers.