CONFIG_ARCH_CNS3XXX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_CNS3XXX.
Result is shown for kernelversion 6.9.5

Cavium Networks CNS3XXX family

modulename: cns3xxx.ko

configname: CONFIG_ARCH_CNS3XXX

Linux Kernel Configuration
└─>Cavium Networks CNS3XXX family
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Support for Cavium Networks CNS3XXX platform.

source code: