Remove hidden connectivity methods usage in ethernet test am: 8cc30c0ad1

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1675425

Change-Id: I12c4e276c23bf73cd5642f088c029fc1d57ff6e3
tree: 34968195efc6f71973d6bf43e4ef3897bf6e53bf
  1. service-t/
  2. tests/