Merge "[FUI20] Expose UnderlyingNetworkInfo as system Api" am: 75b50a5c73 am: ce1b075b2b am: 93af32819c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1563496

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia294d4ec349db10f5486b27f733d4f6d223079bf