[M] Change in coreboot[main]: Add MTCL function to ACPI SSDT tables

[Arthur Heymans (Code Review)]

Attention is currently required from: Cliff Huang, David Ruth, Lance Zhao, Nico Huber, Paul Menzel, Subrata Banik, Subrata Banik, Tim Wawrzynczak.

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/80170?usp=email )

Change subject: Add MTCL function to ACPI SSDT tables
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Patch Set 14: Code-Review+2

(1 comment)

File src/include/mtcl.h:

https://review.coreboot.org/c/coreboot/+/80170/comment/497511f8_c573e5b7 :
PS8, Line 21: __packed
> Added a comment about the struct and how it's meant to be used, as well as why it's explicitly packed. Please reopen if you disagree.

The code generated should be the same anyway. u8 has no alignment requirements so casting that struct should just always work. But it's ok, LGTM