Enable NVDIMM security unit tests


Linux Kernel Configuration
└─>Device Drivers
└─>NVDIMM (Non-Volatile Memory Device) Support
└─>Enable NVDIMM security unit tests
In linux kernel since version 6.2 (release Date: 2023-02-19)  
The NVDIMM and CXL subsystems support unit testing of their device
security state machines. The NVDIMM_SECURITY_TEST option disables CPU
cache maintenance operations around events like secure erase and
overwrite. Also, when enabled, the NVDIMM subsystem core helps the unit
test implement a mock state machine.

Select N if unsure.