Merge "RaResponder: add slla option to RA" am: 60cce55f13

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/2160205

Change-Id: I561143e4cd450bf2bbc40375002ebc899907e7ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>