Add MLDv2 offload for APFv6 multi-devices tests am: 3cc069adea

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3552000

Change-Id: Ib14bf598196b1c0a37bf8e8b8c3ce6b39d5389bb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>