authgraph: add parallel session VTS tests am: d42cb6fa69

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2786799

Change-Id: I6f6fad4898255b2bc8bfb16f3ffa44ff6104a9ef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>