CONFIG_ARCH_IOP331 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_ARCH_IOP331 (not configurable)

modulename: iop331-setup.ko

configname: CONFIG_ARCH_IOP331

Linux Kernel Configuration
└─>IOP3xx Implementation Options
└─>ARCH_IOP331
In linux kernel since version 2.6.12  
The IQ80331, IQ80332, and IQ80333 uses the IOP331 variant.

source code: