Merge "first_stage_mount: Create snapshot devices before launching first_stage_console" am: 0c931aa993

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1565166

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6d92b22489e5bae7acbe7ae7e0ecbf3f738ba719