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Put development flag behind IS_ENG check
Per discussion, this flag was only ever needed for development debugging. Therefore for optimization (not having lots of apps register an observer to DeviceConfig) and potentially reducing problems caused by having multiple packages all reading from one namespace, put behind an ENG build check Test: manual Bug: 265145724 Change-Id: Ia6f2ee781c431088cbb3417c1b6bac86cfce4c13