CONFIG_MACH_W90N960EVB is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_W90N960EVB.
Result is shown for kernelversion 6.9.9

Nuvoton NUC960 Evaluation Board

modulename: mach-nuc960evb.ko

configname: CONFIG_MACH_W90N960EVB

Linux Kernel Configuration
└─>NUC960 Machines
└─>Nuvoton NUC960 Evaluation Board
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Say Y here if you are using the Nuvoton NUC960EVB

source code: