Merge "Expose VCN Network policy APIs." am: 32a2e39563 am: e49bdb60e1 am: 1e33fdf6a7

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I269038dfbd8f36fa381015ed49e24693b1bafa59