Migrate AuthFsHostTest to use MicrodroidBuilder am: d4244be26a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2060022

Change-Id: Id08fac63d62978cb5938914cb3744ce95a680bec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>