Add support for Nullable IpConfiguration am: 7e81787e0b am: 8900f662e5 am: f1117377ba

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/2024300

Change-Id: I6fbc0066c4c9e34ad729d242fa353ef3c6a2e2e1
tree: ef9eae2ed00f36f2d4641fd5cf2e26494dd5d7fc
  1. java/
  2. tests/
  3. .gitignore
  4. Android.bp
  5. TEST_MAPPING