CONFIG_ARCH_ANDES is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

Andes SoCs

configname: CONFIG_ARCH_ANDES

Linux Kernel Configuration
└─>SoC selection
└─>Andes SoCs
In linux kernel since version 6.17 (release Date: 2025-09-28)  
This enables support for Andes SoC platform hardware.