Merge "Make isTetheringSupported respect all tethering downstreams" am: 8dcc3000fd am: c4b5faefaf am: 024ed79270

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1938694

Change-Id: I39f30e72f8a1f29c3242a3cb0784668c02a5a7ec