Change in coreboot[master]: soc/intel/xeon_sp: Set PCIe secure register lock

[Marc Jones (Code Review)]

Attention is currently required from: Anjaneya "Reddy" Chagam, Jonathan Zhang, Johnny Lin, Angel Pons, Morgan Jang, Patrick Rudolph.
Marc Jones has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52164 )

Change subject: soc/intel/xeon_sp: Set PCIe secure register lock
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Patch Set 2: Code-Review-2