Merge "Update DataSaverBackend to use NetworkPolicyManager.Listener." am: 90f59be59a am: bf29c73cb7

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/1612821

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1959ff61fdc91f0006d9eda91ccde6917025e07c