Change in coreboot[master]: mb/*: drop obsolete devicetree option s0ix_enable

[Angel Pons (Code Review)]

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/45546 )

Change subject: mb/*: drop obsolete devicetree option s0ix_enable
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Patch Set 1:

I'd prefer if this were done alongside CB:45543, so that one can easily check if defaults for a mainboard change. However, there's commits sandwiched between these two changes, so it's not trivial. One possible approach is to split by platform instead