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

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

Change-Id: I93ecde943c8e40b2b34d68ef1af441579cbbd36e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>