Change in coreboot[master]: spd: Create new folder for SPD files

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Furquan Shaikh, Martin Roth, Amanda Hwang, Patrick Rudolph, EricR Lai.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49338 )

Change subject: spd: Create new folder for SPD files
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Patch Set 4:

(1 comment)

File src/mainboard/google/brya/Kconfig:

https://review.coreboot.org/c/coreboot/+/49338/comment/cd300208_eb564477 
PS4, Line 49: LP4X_SPD_SOURCE_PATH
> We can try it and see any inconvenient that we can improve. […]

Since adding a new SPD only has to be done once per platform now, I don't think it will be too much of a burden to have people pass the `src/soc/intel/alderlake/spd` path argument when adding the new SPD. I would definitely have to sit and think about how to have make do something like that...