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: I39b2b030e8c47883390f337ab522a690f11b2db7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>