sed-opal: add UID of Locking Table.

As described in ch. 6.3, Table 240 in TCG Storage
Architecture Core Specification document.

It's also referenced in TCG Storage Opal SSC Feature Set:
Single User Mode document, ch. 3.1.1.1 Reactivate method.

It will be used later in Reactivate method implemetation
for sed-opal interface.

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>