[000/241] Finish migration to Kconfig or CFG namespace

Hey all,

The intention of this series isn't to apply it just yet. This was a very quick scripted migration and so there's cases where we do more than one symbol, or we can see there's define but unused symbols. But it also shows that with the last few series I've posted, we're nearly done. With this series applied, everything builds still, and the resulting binaries seem to be the same (I'm doing a build where I keep before/after so I can check checksums now).