Merge "Tethering: remove dead code" am: abc0246c4f am: 26ddce1db9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2138294

Change-Id: I3ade6729a46f1e77ac4519ed6bdd9a102885bc61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>