Add global change ethernet state API am: e732c50882 am: 7a7de343a2

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/2027234

Change-Id: I122a1eda9e9328e0f1ddcfe1e546b8fe3cc33d75
tree: 0d278ab1fdabf55ef5b6d55b9a19334d07f9bb6d
  1. service-t/
  2. tests/