Merge "Validate or set the eth specifier on update Iface" am: 85694dc277 am: c9bb8aab8b am: 2ec893bbe7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2128511

Change-Id: I4da6cc30884fe09101e379dd5e52ed3fc143b85f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>