Add dirgroup for trusty genrule am: 1dfcec3c98 am: 8c4ec25162

Original change: https://android-review.googlesource.com/c/trusty/app/cast-auth/+/3303740

Change-Id: I317d9c81d070c6d1d24f09b6acda414fd42c4877
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>