[M] Change in coreboot[main]: tree: Use boolean for dptf_enable

[Nico Huber (Code Review)]

Attention is currently required from: Dinesh Gehlot, Elyes Haouas, Eran Mitrani, Eric Lai, Frans Hendriks, Jakub Czapiga, Jayvik Desai, Jonathon Hall, Kapil Porwal, Lean Sheng Tan, Maxim, Michał Żygowski, Nick Vaccaro, Piotr Król, Pranava Y N, Rishika Raj, Subrata Banik, Tarun, Werner Zeh.

Nico Huber has posted comments on this change by Elyes Haouas. ( https://review.coreboot.org/c/coreboot/+/84161?usp=email )

Change subject: tree: Use boolean for dptf_enable
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Patch Set 1:

(1 comment)

Patchset:

PS1:
> I prefer true/false. It reduce ambiguity and potential errors and it prepare for modern C.
> (C23 uses true and false instead of 0 and 1)

I find it highly irritating to call something true/false that would be on/off or
enabled/disabled in natural language. 1/0 seems like the canonical equivalent,
we even put these on switches [1].

Does the compiler warn with C23 enabled?

[1] https://www.boatersland.com/images/img/jr-products-13735-mini-on-off-labeled...