[XS] Change in coreboot[main]: soc/amd/genoa: Enable PM and cf9 IO early

[Martin L Roth (Code Review)]

Attention is currently required from: Arthur Heymans, Felix Held.

Martin L Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/76505?usp=email )

Change subject: soc/amd/genoa: Enable PM and cf9 IO early
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Patch Set 6:

(1 comment)

File src/soc/amd/genoa/early_fch.c:

https://review.coreboot.org/c/coreboot/+/76505/comment/ccf8c155_a93989ea :
PS2, Line 16: 	enable_acpimmio_decode_pm04();
> not 100% sure about this one; it should either be removed or an additional kconfig option needs to b […]

The Genoa PPR claims that PMIO can still be accessed through the CD6/CD7 mechanism, so I added the Kconfig option to allow for that. Of course, the public PPR doesn't even mention the FCH section. :-/