Add IPv6 neighbor solicitation offload for APFv6 multi-devices tests am: 8e8bbcabde

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3551081

Change-Id: I34fa47b2a093691e4949ef83d04226f4b6633fcf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>