Merge "Clean up IMS based interfaces to use a push model instead of poll" am: aea9e7c143 am: a4f7362b23 am: d23e9a07b4

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1425374

Change-Id: Id2c4938f091bc46bf903cefd0cc2aea90aead7e8