Change in coreboot[master]: soc/intel/xeon_sp/: Fix SMI_LOCK setting

[Stefan Reinauer (Code Review)]

Attention is currently required from: Marc Jones, Jonathan Zhang, Angel Pons, Patrick Rudolph.
Stefan Reinauer has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51452 )

Change subject: soc/intel/xeon_sp/: Fix SMI_LOCK setting
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Patch Set 3:

(1 comment)

File src/soc/intel/xeon_sp/cpx/cpu.c:

https://review.coreboot.org/c/coreboot/+/51452/comment/5c0d7970_bb40d453 
PS2, Line 183: 			pmc_lock_smi();
> My preference was to lock it when SMI was enabled, if the platform is set to locking. […]

I think locking all SMM related bits in one place makes sense.