Existing snapshot code will no longer work from VNDK deprecation, but it can give confusion to users if we keep code for the snapshot - and it adds complexity on existing code while it is not in use. This change removes all snapshot definition except host snapshot and its usage. Bug: 330100430 Bug: 332986564 Test: AOSP CF build succeeded Change-Id: Ieb6fa43d5e38315c662ce997bc305b744b367c24