Merge "Add DHCPv6 packet decode function." am: 96ae6c0318

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2435135

Change-Id: Ia519c070bf4fc62f264a1787d8afa94b613cfa57
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>