[S] Change in coreboot[master]: soc/intel/xeon_sp: Initialize PCH and IIO IOAPIC

[Shuo Liu (Code Review)]

Attention is currently required from: Johnny Lin, Christian Walter, Arthur Heymans, Tim Chu.

Shuo Liu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/70498 )

Change subject: soc/intel/xeon_sp: Initialize PCH and IIO IOAPIC
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Patch Set 1: Code-Review+1