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

Nuvoton NPCM Architecture

configname: CONFIG_ARCH_NPCM

Linux Kernel Configuration
└─>Nuvoton NPCM Architecture
In linux kernel since version 3.10 (release Date: 2013-06-30)  
selects
CONFIG_PINCTRL


is selected by
CONFIG_ARCH_WPCM450