Revert "Migrate AuthFsHostTest to use MicrodroidBuilder" am: 4bdd2e837d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2060031

Change-Id: Icd2c0b91c39501d981d48d35e9b25c1e8f81771e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>