Merge "Remove notification permission feature flag" into tm-dev am: 23a85a1f96

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/18164272

Change-Id: Ifb623c3650ae1c46efa0485979f412b80896b11c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>