Remove Unused Code From EthernetNetworkFactory am: 698b59510f am: e7048826ba am: 3ed5c3997b

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1722876

Change-Id: I96a1b4b8ecb6d0821f8efa7482b4c69d835e54a0
tree: 5f18b1de597aa72651d1a5109bb9156861878406
  1. service-t/
  2. tests/