[S] Change in coreboot[main]: acpi: Add support for DRHD size reporting

[Angel Pons (Code Review)]

Attention is currently required from: Arthur Heymans, Chen, Gang C, Christian Walter, Cliff Huang, Dinesh Gehlot, Eran Mitrani, Jakub Czapiga, Jeff Daly, Jincheng Li, Johnny Lin, Jonathan Zhang, Kapil Porwal, Lance Zhao, Lean Sheng Tan, Nick Vaccaro, Nico Huber, Patrick Rudolph, Paul Menzel, Sean Rhodes, Shuo Liu, Subrata Banik, Tarun, Tim Chu, Tim Wawrzynczak, Vanessa Eusebio, Werner Zeh.

Angel Pons has posted comments on this change by Shuo Liu. ( https://review.coreboot.org/c/coreboot/+/82429?usp=email )

Change subject: acpi: Add support for DRHD size reporting
......................................................................

Patch Set 17:

(1 comment)

File src/include/acpi/acpi.h:

https://review.coreboot.org/c/coreboot/+/82429/comment/bfa0d5c0_c9193004?usp... :
PS16, Line 1855: u32
> TBH, I don't get the log2_64().

The register encoding as described in the spec works this way. A bitfield value of N means `2^N` 4k pages.