Change in coreboot[master]: src/acpi: Add initial support for HMAT

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Anjaneya "Reddy" Chagam, Jonathan Zhang, David Hendricks, Stefan Reinauer, Angel Pons, Subrata Banik.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52047 )

Change subject: src/acpi: Add initial support for HMAT
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Patch Set 5: Code-Review+1

(2 comments)

File src/include/acpi/acpi.h:

https://review.coreboot.org/c/coreboot/+/52047/comment/cc481616_7903fe84 
PS5, Line 242: u8 min_transfer_size;
this has a slightly odd definition, a comment may be helpful

https://review.coreboot.org/c/coreboot/+/52047/comment/bdaed25b_43a14b50 
PS5, Line 261: 	u32 cache_attributes
Some `enum`s or `#define` values could be useful to describe this bitfield