Merge "[CS17]Remove useless code(AsyncChannel) from ConnectivityService" am: 2dafdfb0f8 am: e15c876029

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1625701

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic6aa11902b9ade040bee702650722edfd65b9113