Merge "Tethering: ignore duplicate upstream changed event" am: c2e434bbc7 am: cedb8d1153

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2390555

Change-Id: I3de7a3565e9759941fc230181296789e0d6daa17
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>