Merge "Tethering: ignore duplicate upstream changed event" am: c2e434bbc7 am: cedb8d1153 am: e5efaba279 am: 6de5dbb2de

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

Change-Id: I3a6e45ba84512a917aa0007aa4b7ff2b4416aef7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>