Overlay: disable proximity speaker preference for mako

This is an unfortunate resolution for mako, but the
    device has a notoriously problematic proximity
    sensor. Apparently, the screen off wakelock does
    not play nicely when the proximity sensor is
    utilized elsewhere.

Change-Id: Ie66504176b8bc3c095d6ceeeccaac135d472fc77
Merge remote-tracking branch 'slim/kk4.4' into kk44s