Add dirgroup for trusty genrule am: 9f451b84e7 am: 4a9be3bd96

Original change: https://android-review.googlesource.com/c/trusty/app/gatekeeper/+/3304359

Change-Id: If1d268864c49bf6eae20c06139632afa4ddb27a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>