Decode multiple IA prefix options in one IA_PD option. am: 28c2bee2d9 am: 3d80c69ada am: 02d1f76c4d

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

Change-Id: I1e6a2f6ca118effb3cd5607c92a181a602ae4b64
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>