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

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

Change-Id: I25bad73921b928e1a80ad2bbf8af3af8e713af1c