Merge "add post_notification permission to manifest so the package can send...

Merge "add post_notification permission to manifest so the package can send notifications on T+" into tm-dev am: 2a61825f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DocumentsUI/+/18756497



Change-Id: Ifef3eda41022c9bfe1ec00a8afdc15946c61881d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>