[automerged blank] DO NOT MERGE: Add stub class and filegroup for Ethernet service. 2p: 77f3dd80c2

Blank merge reason: commit message contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/17197668

Change-Id: Id6d97bd0fa04f7ea48a3494e9fe687d141f4259e