Change in coreboot[master]: soc/intel/xeon_sp: Add PCH lockdown

[Angel Pons (Code Review)]

Attention is currently required from: Marc Jones, Furquan Shaikh, Martin Roth, Jonathan Zhang, Johnny Lin, Stefan Reinauer, Rocky Phagura, Patrick Rudolph.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49849 )

Change subject: soc/intel/xeon_sp: Add PCH lockdown
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Patch Set 4:

(1 comment)

File src/soc/intel/common/pch/Kconfig:

https://review.coreboot.org/c/coreboot/+/49849/comment/dbc18f38_2f667a8e 
PS4, Line 21:  if !XEON_SP_COMMON_BASE
> Is there a better way to categorize this, or to have a set of convenience groups for these options?  […]

SERVER/CLIENT distinction would be a good starting point. I think I brought this up in the past, but didn't materialize.