Change in coreboot[master]: soc/intel/alderlake: Add tcss code

[Deepti Deshatty (Code Review)]

Attention is currently required from: V Sowmya, Furquan Shaikh, Rizwan Qureshi, Sridhar Siricilla, Tim Wawrzynczak, Patrick Rudolph.
Deepti Deshatty has removed Deepti Deshatty from this change.  ( https://review.coreboot.org/c/coreboot/+/52188 )

Change subject: soc/intel/alderlake: Add tcss code
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Removed reviewer Deepti Deshatty.