Merge "authfs: support multiple threads" am: 377602e35a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2056403

Change-Id: Icb8202d287b431c9a0dbfc8f0e2fad3036010178
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>