Merge "Remove unused notification pipeline flag code" into tm-qpr-dev am: 241b46e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20176971



Change-Id: I335761f448698aa61ff5d4e4092ee9ed72b50ab5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>