Merge "Replace Preconditions.checkNotNull with Objects.requireNonNull." am: 7ab9fb8f1a

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1927229

Change-Id: I163b3fd41f4aa01d60cf74ec159806d9c6c12a15
tree: a4066c37db8e59f122d88489c06eaddcc6a4505b
  1. service-t/
  2. tests/