Merge "Add on-device signing binary." am: 73dea057c2 am: f14403b878 am: 7475a24c04

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia445af69af56c6707d9d7c7ddfa64b3a42f0a3d7