Merge "add post_notification permission to manifest so the package can send notifications on T+" into tm-dev am: 2a61825f am: 4d41c8be am: 7f8fdcf2

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



Change-Id: I0984347c55dd64a19ad47a05a859206c1dda6d2a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>