Merge "[SB Refactor] Add docs for OEMs about the new status bar pipeline." into tm-qpr-dev am: b638b557b8 am: 6e4f6d3919

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20806641

Change-Id: I99854bfe435f38c005144263f9e0dca9e6fdca41
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>