[S] Change in coreboot[master]: [RFC] soc/intel/skylake: Use boolean type for s0ix_enable option

[Nico Huber (Code Review)]

Attention is currently required from: Arthur Heymans, Elyes Haouas, Eric Lai, Jan Samek, Mario Scheithauer, Michael Niewöhner, Michał Żygowski, Piotr Król, Subrata Banik.

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75871?usp=email )

Change subject: [RFC] soc/intel/skylake: Use boolean type for s0ix_enable option
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Patch Set 3:

(2 comments)

Patchset:

PS3:
> SG!

If we do this at a bigger scale, I would prefer an enum. Then it could
look as nice as
```
        register s0ix = enabled
```

File src/mainboard/acer/aspire_vn7_572g/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/75871/comment/f79b9e6d_9bcf4dcd :
PS3, Line 314: true
> Interesting. I would have expected "" to necessary. The tree is not consistent about this either.

The quotes are only needed if there is whitespace, otherwise we have this rule:
```
[^ \n\t]+               {yylval.string = ... return(STRING);}
```

Never thought about it, but even filling arrays should be possible if one doesn't
add spaces (please don't) :D