Remove INetworkManagementService usage from EthernetTracker. am: 39e7a77991

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

Change-Id: I9b20d45aa24fd0a70086463f3a77941cfac0bedc
tree: 2e79fc5b00880f63efaf72f1356b7f5367760510
  1. service-t/
  2. tests/