Merge "decouple Bubble from NotificationEntry" into rvc-dev am: 37a5b89e am: 4744bb5a am: 38826e76

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11873745

Change-Id: Idc513ea2a74d1993114e1af3d10afdd4b0a50f87