CONFIG_CPU_W90P910 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_W90P910 (not configurable)

modulename: nuc910.ko

configname: CONFIG_CPU_W90P910

Linux Kernel Configuration
└─>CPU_W90P910
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
Support for W90P910 of Nuvoton W90X900 CPUs.

source code: