Merge changes from topic "rway_nullable_nc" am: 930cc5dd8a

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/2008254

Change-Id: Ib30eec9e71791f63a7a5ea9721fde35fba1b8c92
tree: a45baaf141d953b626830ec42f5cf1f4e795e8de
  1. service-t/
  2. tests/