Change in coreboot[master]: soc/amd/cezanne/fsp: Set the void_function parameter

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Karthik Ramasubramanian, Felix Held.
Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58991 )

Change subject: soc/amd/cezanne/fsp: Set the void_function parameter
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Patch Set 3:

(1 comment)

File src/soc/amd/cezanne/fsp_s_params.c:

https://review.coreboot.org/c/coreboot/+/58991/comment/29edf0b5_719d75d7 
PS3, Line 24: scfg->void_function = (uintptr_t)fsp_s_yield;
> What happens if FSP re-inits any of the IP blocks that coreboot is trying to leverage at this point? […]

I know for a fact that FSP will re-init the UART. This doesn't cause a problem since it's a very simple controller. Since FSP is huge, I'm not sure what else it is initializing. I haven't seen a problem though...

I think FSP sets up its own exception handlers as well. I haven't actually tried to force an exception in this callback though.