ethernet: stop using EthernetManager shims am: 81b4b38067 am: b5bd581bc8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18728709

Change-Id: I231a62bbfb82da9e4f8962dc71f9c60fd9847698
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>