Merge "Add TetheredInterface{Request, Callback} interface" am: 7269fb17fd am: 5b6e2b3509 am: 12f02fa941 am: 0287eafe07

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

Change-Id: I34b9fae1da161ae3db5d22f56334ea7c9c3b9278