Merge "Add TetheredInterface{Request, Callback} interface" am: 7269fb17fd am: 5b6e2b3509 am: 12f02fa941

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1873874

Change-Id: I984cb442face986744fa51a2771ddd6c3d4fc9f7