Add a listener which replies with an object containing one or many flags
as well as parsing methods. This should replace the previous listener,
but we need to keep the old one around for now because Google Play
services is reliant on it.
Bug: 126414261
Test: atest FrameworksCoreTests:DeviceConfigTest
Change-Id: Ie8d32eced077a8df17be824e94271bd6b15fae3d
ea9881d881