Code cleanup on EthernetNetworkFactoryTest am: 18ed8f6680 am: 99fea53b7c am: a22d2112ca

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1935577

Change-Id: I67161da90527e2a70b875844221a06f6a28a7f96