[M] Change in coreboot[main]: soc/intel: Refactor ITSS macros

[Shuo Liu (Code Review)]

Attention is currently required from: Arthur Heymans, Christian Walter, Dinesh Gehlot, Eran Mitrani, Jakub Czapiga, Jayvik Desai, Johnny Lin, Jonathan Zhang, Lean Sheng Tan, Nick Vaccaro, Patrick Rudolph, Rishika Raj, Subrata Banik, Tarun, Tim Chu, Werner Zeh.

Shuo Liu has posted comments on this change by Subrata Banik. ( https://review.coreboot.org/c/coreboot/+/84183?usp=email )

Change subject: soc/intel: Refactor ITSS macros
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Patch Set 2: Code-Review+1