Revert "first_stage_mount: Create snapshot devices before launching first_stage_console"

This reverts commit 9583e92257ab85075231b014f0999d5a5dab9910.

Reason for revert: <fail to flash a device>
Bug: 178433260

Change-Id: I0e9ab3eff38ddf9ad420cf1479eca16f6f29d1b5
3 files changed