Add multi-dex support to hiddenapi am: 86b5f86d8d

Original change: https://android-review.googlesource.com/c/platform/art/+/2425068

Change-Id: I75a18833f25ae957546d6b5563a832b5d4441da0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>