Disk Encryption: Enable software file system encryption

Disk Encryption: Enable software file system encryption

BZ: 25592

Include device-mapper and SHA256 and CBC crypto modes to support
User File system encryption use case.

Change-Id: I4b2e74cdc45df1c2abc982f5af591ccd7dd06f2d
Signed-off-by: Norvin Shuster <Norvin.Shuster@intel.com>
Reviewed-on: http://android.intel.com:8080/37062
Reviewed-by: Shuster, Norvin <norvin.shuster@intel.com>
Reviewed-by: Saripalli, Ramakrishna <ramakrishna.saripalli@intel.com>
Reviewed-by: Allyn, Mark A <mark.a.allyn@intel.com>
Reviewed-by: Mangalampalli, Jayant <jayant.mangalampalli@intel.com>
Tested-by: Mangalampalli, Jayant <jayant.mangalampalli@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>