Merge "[CS17]Remove useless code(AsyncChannel) from ConnectivityService" am: 2dafdfb0f8 am: e15c876029 am: d2e6eb1c35

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6192035f3be707c6f840b373579d2666ca5c3ac6