Replace reference of NetworkAgent#setLegacyExtraInfo am: ddfc20d4f1

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1645031

Change-Id: Ie9fb99ada7c78db35a066d5a01d69c0dcadcc232
tree: 7ac581c5ea67af3b062c466c140c37d58dbbdd70
  1. service-t/
  2. tests/