[XS] Change in coreboot[main]: soc/intel/alderlake: Hook up FSP repo for RPL-P/S

[Matt DeVillier (Code Review)]

Attention is currently required from: Michał Żygowski, Nick Vaccaro, Subrata Banik.

Matt DeVillier has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78190?usp=email )

Change subject: soc/intel/alderlake: Hook up FSP repo for RPL-P/S
......................................................................

Patch Set 1:

(1 comment)

File src/soc/intel/alderlake/Kconfig:

https://review.coreboot.org/c/coreboot/+/78190/comment/ffac0c34_554c33ed :
PS1, Line 427: 	default "3rdparty/fsp/AlderLakeFspBinPkg/Client/AlderLakeS/Fsp.fd" if SOC_INTEL_ALDERLAKE_PCH_S
> Actually, this should not be needed anymore if RPL-S FSP is here. We could basically drop ADL-S FSP.

completely agree, but figured that should be a separate patch (along with dropping the now-superfluous vendorcode headers). I wanted this patch to simply add support for using the RPL-U/P binaries/headers in the submodule without changing the behavior for any existing boards/configs.