Merge "identity: Clarify validity period for auth keys." am: 3522198eb4

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2475025

Change-Id: If9283963190f517e3da3b232ef6ff7f1cd274b7c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>