Decode multiple IA prefix options in one IA_PD option. am: 28c2bee2d9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2691414

Change-Id: I8516f9a39349da8f8066308057fc9c6da252b9fb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>