Merge "Expose VCN Network policy APIs." am: 32a2e39563 am: e49bdb60e1

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1544188

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If913e88908d3c1f92f000ddd7b303aec693fd42e