[S] Change in coreboot[main]: soc/intel/braswell: Unify DPTF enablement

[Nico Huber (Code Review)]

Attention is currently required from: Erik van den Bogaert, Frans Hendriks, Matt DeVillier, Michał Żygowski, Piotr Król.

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78743?usp=email )

Change subject: soc/intel/braswell: Unify DPTF enablement
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Patch Set 2: Code-Review+1

(2 comments)

Patchset:

PS2: 
Thanks for cleaning this up!

File src/mainboard/google/cyan/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/78743/comment/f4799e13_51d05a0f :
PS2, Line 98: off
I would assume that `DptfDisable` had the strongest meaning (i.e. the blob
actually disables the device, while `off` only made coreboot ignore it).
As it wasn't set, shouldn't we turn the device `on` here?

Same for Strago.