Change in coreboot[master]: IASL: Ignore IASL's "Missing dependency" warning

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Michał Żygowski, Frans Hendriks, Tristan Corrick, Paul Menzel, Nick Vaccaro, Angel Pons, HAOUAS Elyes, Piotr Król, Wim Vervoorn.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59880 )

Change subject: IASL: Ignore IASL's "Missing dependency" warning
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Patch Set 5:

(1 comment)

Patchset:

PS5: 
maybe we can remove the need for this CONFIG instead?

For all of the google boards, one reason for the warning is that the EC SIO device has _CRS and _PRS
but not _SRS. However, _CRS and _PRS match exactly, so I don't think _PRS is required here anyway. The same is also true for ECUI in the same file, src/ec/google/chromeec/acpi/superio.asl.

Many SIO devices in the tree also seem to have the same issue, where _PRS isn't listing anything different than is already in _CRS, so why is it there in the first place? Or I guess if there is a
compatibility concern, you could I suppose add an empty _SRS method too, because if the OSPM can only choose from the list in _PRS, and it already exactly matches _CRS, then _SRS wouldn't really take any effect anyway.