Remove INetworkManagementService usage from EthernetTracker. am: 39e7a77991 am: 020d4fa16a am: d21f8fa352

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1925902

Change-Id: I7ea3bb0e97d271a0f6100ae3e602dc6dae522e3d
tree: 2e79fc5b00880f63efaf72f1356b7f5367760510
  1. service-t/
  2. tests/