AuthGraph: move code into library am: 6c09af215d am: 8a036f621d

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

Change-Id: Ic2e820c2c720faa535ca36887a4466f4c0b5f770
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>