CONFIG_ARCH_CIX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Cixtech SoC family

configname: CONFIG_ARCH_CIX

Linux Kernel Configuration
└─>Platform selection
└─>Cixtech SoC family
In linux kernel since version 6.17 (release Date: 2025-09-28)  
This enables support for the Cixtech SoC family,
like P1(sky1).