Updating test in case ethernet is not available

Updating EthernetManagerPermissionTest to account for ethernet
potentially not being available. Also updating owners for this
particular file.

Bug: 218552964
Bug: 210485380
Test: atest CtsPermissionTestCases:
android.permission.cts.EthernetManagerPermissionTest

Change-Id: Ie621a17199a4079c1695d18ec8d24cba09bc4336
2 files changed