Merge "add post_notification permission to manifest so the package can send notifications on T+" into tm-dev am: 2a61825f am: 4d41c8be am: 7b031108 am: 04b38c5a

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



Change-Id: I860fc606b75d68ff5362bd921c295575d410730c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>