nfit_test: fix security state pull for nvdimm security nfit_test

The override status function needs to be updated to use the proper
request parameter in order to get the security state.

Fixes: 3c13e2ac ("...Add test support for Intel nvdimm security DSMs")
Reported-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>