Change in coreboot[master]: mb, soc: Add the SPD_CACHE_ENABLE

[EricR Lai (Code Review)]

Attention is currently required from: Tim Wawrzynczak, Nick Vaccaro, Zhuohao Lee, Patrick Rudolph.
EricR Lai has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62294 )

Change subject: mb, soc: Add the SPD_CACHE_ENABLE
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Patch Set 4:

(1 comment)

File src/mainboard/google/brya/romstage.c:

https://review.coreboot.org/c/coreboot/+/62294/comment/33c6c948_7e9c1c94 
PS4, Line 25: 	if (dimms_changed) {
> This code: https://review.coreboot. […]

In this code it is guard by CONFIG(SPD_CACHE_ENABLE), but I think it'd better guard by the specific SODIMM config, WDYT?