CONFIG_ARCH_WPCM450 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support for WPCM450 BMC (Hermon)

modulename: wpcm450.ko

configname: CONFIG_ARCH_WPCM450

Linux Kernel Configuration
└─>Nuvoton NPCM Architecture
└─>Support for WPCM450 BMC (Hermon)
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
General support for WPCM450 BMC (Hermon).

Winbond/Nuvoton WPCM450 BMC based on the ARM926EJ-S.

source code: