trusty: set the bugreport user explicitly am: ab91382041

Original change: https://android-review.googlesource.com/c/device/generic/trusty/+/3137644

Change-Id: I5fbf87402dda3beb681fc3197c98460b81e8062f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>