Merge "add post_notification permission to manifest so the package can send notifications on T+" into tm-dev am: 2a61825f am: 4d41c8be am: 7f8fdcf2 am: 89714a98

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



Change-Id: Ia882418609f3a1011469d31bdac3931deb514311
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>