[M] Change in coreboot[main]: acpi: Add IO Remapping Table structures

[Angel Pons (Code Review)]

Attention is currently required from: Arthur Heymans, Cliff Huang, Lance Zhao, Martin L Roth, Naresh Solanki, Patrick Rudolph, Paul Menzel, Tim Wawrzynczak.

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/77884?usp=email )

Change subject: acpi: Add IO Remapping Table structures
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Patch Set 6:

(2 comments)

Commit Message:

PS6: 
Which specification is this code based on? I found `DEN0049E_IO_Remapping_Table.pdf` (non-confidential document) on the ARM website, but I'm not sure if this is the same document you've used.

File src/include/acpi/acpi.h:

https://review.coreboot.org/c/coreboot/+/77884/comment/0489fc52_46d7dc6f :
PS6, Line 92: 	IORT,   /* Input Output Remapping Table */
I can't find the specification for this table in the ACPI specifications, only in ARM document `DEN0049E_IO_Remapping_Table.pdf`. I think it should be added to the second group ("Additional proprietary tables used by coreboot") instead.