sed-opal: add RangeStartRangeLengthPolicy parameter.

sed-opal: add RangeStartRangeLengthPolicy parameter.

As desribed in ch. 3.1.1.1.1.2 of TCG Storage Opal SSC Feature Set:
Single User Mode document.

To be used later in Reactivate method implementation and in function
for retrieving SUM device status.

Signed-off-by: Ondrej Kozina <okozina@redhat.com>
Reviewed-and-tested-by: Milan Broz <gmazyland@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>