Merge "Add NeighborAdvertisement class to build/prase NA packet." am: d5a8a30a am: 3df54865 am: 9dc63369

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1535653

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7b1985641a2603cf4d4d376de6d3ed16eb4edb62