Add getInterfaceList API implementation in Ethernet service. am: 260521db42

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/2029725

Change-Id: Id8eba7b7f968c04f233fe8e3629a236aab9e2bc9
tree: 96c427154dc269613ab46437e343a5976be99037
  1. java/
  2. tests/
  3. .gitignore
  4. Android.bp
  5. TEST_MAPPING