Resolved minor warnings in a few notification and accessibility am: 53c2c0a8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19945424



Change-Id: I23204d8a48298f09724a95f8672810413deafb8c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>