Merge "add post_notification permission to manifest so the package can send notifications on T+" into tm-dev am: 2a61825f am: 37eb297b am: 76fb638d am: d501a7c4

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



Change-Id: I26e9665eb8302786596064a24e9c0e18285ac478
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>