build-config: cast_auth.test timeout on multiple devices am: 93e253ae87 am: 991537a049

Original change: https://android-review.googlesource.com/c/trusty/app/cast-auth/+/3030863

Change-Id: Iadeedbf239acf73e360050a0521ca2a45bb9ca9e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>