uapi: sed-opal fix IOW for activate lsp to use correct struct

The IOC_OPAL_ACTIVATE_LSP took the wrong strcure which would
give us the wrong size when using _IOC_SIZE, switch it to the
right structure.

Fixes: 058f8a2 ("Include: Uapi: Add user ABI for Sed/Opal")

Signed-off-by: Scott Bauer <scott.bauer@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>