Clean up permission validation in EthernetServiceImpl am: a4e8e77e24 am: 023d842244

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/2018836

Change-Id: I4bdfc511fb7530bce0cd4a4e0572841943e0b7ff
tree: c1f108f4d0056b5ffc73872f24359a2749a152f4
  1. service-t/
  2. tests/