Merge "Add on-device signing binary." am: 73dea057c2 am: f14403b878

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1513029

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia01ec222b944c159f4f0c4c1cdac00fd38e4fb9f