Change in coreboot[master]: soc/intel/*: only enable PM Timer emulation if the PM Timer is disabled

[Michael Niewöhner (Code Review)]

Attention is currently required from:  Felix Singer, Lance Zhao, Nico Huber, Furquan Shaikh, Tim Wawrzynczak, Paul Menzel, Angel Pons, Subrata Banik, Aaron Durbin, Patrick Rudolph.
Michael Niewöhner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57930 )

Change subject: soc/intel/*: only enable PM Timer emulation if the PM Timer is disabled
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Patch Set 4:

(1 comment)

Patchset:

PS4:
> I wonder why the SKL/KBL BIOS spec says that ACPI timer emulation should always be enabled.

We had a discussion on that (CB:45000) but we are not sure if the BIOS spec has just borked wording.
> KBL and CFL FSP only enable ACPI timer emulation when the TCO timer is disabled.

Correct. Just a little correction: s/TCO timer/ACPI timer/ (they are different timers, but the UPD naming is just bullshit)