Handle neighbor lost event am: e600bef8f9 am: dab9bb4938

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1586426

Change-Id: I5c756835916a21838b83923c9406ea01758f6500
tree: bdf3d17fdec1457f863bcdfc26d9fa61a49be5ff
  1. service-t/
  2. tests/