tools/testing/cxl: Add "Unlock" security opcode support

Add support to emulate a CXL mem device support the "Unlock" operation.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166983614730.2734609.2280484207184754073.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: Dan Williams <dan.j.williams@intel.com>