Remove Unused Code From EthernetNetworkFactory am: 0ba7e4cc58 am: 1fcc6843f8

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

Change-Id: I2a4f5caa041f6b0e6f950e536ab74be71a5a2a53
tree: 5f18b1de597aa72651d1a5109bb9156861878406
  1. service-t/
  2. tests/