[Revert^2] Reject TetheringRequests that fuzzy-match existing ones am: 8b29d287f5 am: f4191218f8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3543706

Change-Id: Ib1ec4f02684d570610cee3cb934aefeefbdcc322
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>