Merge "Add `getNdTrafficClass` to load traffic class for specific interface" into main am: b6da477644 am: 526eeb89e5

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

Change-Id: I7dcc5fa205fc119893e228bbde2ea91f66f35ef4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>