Merge "Add NeighborAdvertisement class to build/prase NA packet." am: d5a8a30a4d am: 3df5486586 am: 99b0cbb34d

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I48f79310f2fe91437583b5c3f680d893f6b1ff84