Add global change ethernet state API am: 8a4c9c3564

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/17244759

Change-Id: I8a2fba97f0418a86ca98414133455382761c23bd
tree: 224ced55e27a3cf4538c7c063ec6c8600d5621e3
  1. java/
  2. tests/
  3. .gitignore
  4. Android.bp
  5. TEST_MAPPING