Merge "decouple Bubble from NotificationEntry" into rvc-dev am: 7fc567f7a3 am: 71bfeb52c3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11668704

Change-Id: I3e3e68f930b2468bf19e084dbccd754d4c4c7ec5