[automerger skipped] Merge "Don't attach private Notification to A11yEvent when user locked" into pi-dev am: fa06b865 -s ours

am skip reason: skipped by user steell

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15081022

Change-Id: I782a41de18ca5edf5125a8cab441bfd1420a6041