CONFIG_ARC_PLAT_EZNPS is not available for thedefaultarchitecture x86.
Result is shown for architecture arc
default or selected kernelversion does not have config value CONFIG_ARC_PLAT_EZNPS.
Result is shown for kernelversion 6.9.2

"EZchip" ARC dev platform

configname: CONFIG_ARC_PLAT_EZNPS

Linux Kernel Configuration
└─>"EZchip" ARC dev platform
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Support for EZchip development platforms,
based on ARC700 cores.
We handle few flavors:
- Hardware Emulator AKA HE which is FPGA based chassis
- Simulator based on MetaWare nSIM
- NPS400 chip based on ASIC