Move settingslib overlays to framework-res.

AAPT2 no longer supports overlays of static libraries. As a result,
these overlays don't work correctly any more.

To fix, move the overlay config resources into framework-res.
They can still be read by any of the apps using settingslib, but now
actually work without having to override for each app.

Bug: 33694217
Test: robotests
Change-Id: I58df748d7646e8caee18614d87af1333fc84985c