Merge "Add `getNdTrafficClass` to load traffic class for specific interface" into main am: b6da477644

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/3115587

Change-Id: I9986a54871b77cb1d0f1dac5ba49047bc56212c8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>