AuthGraph: move code into library am: 6c09af215d

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2817380

Change-Id: I6c5ca5325a9c71c67f806497502a9494204315d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>