Change in coreboot[master]: mb/ocp, soc/intel/xeon_sp: Use common ASL POST defines

[Lean Sheng Tan (Code Review)]

Attention is currently required from: Anjaneya "Reddy" Chagam, Johnny Lin, Christian Walter, Angel Pons, Arthur Heymans, Morgan Jang, Tim Chu.
Lean Sheng Tan has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63989 )

Change subject: mb/ocp, soc/intel/xeon_sp: Use common ASL POST defines
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Patch Set 1: Code-Review+2