Merge "Add methods to get the minimal preferred/valid lifetime of delegated prefix." into main am: fd9f5586ee am: 5265f33639

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2691416

Change-Id: If3174e4096932eebf8e83bd26549e4b56370840e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>