CONFIG_ARCH_IOP33X is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

IOP33x-based

configname: CONFIG_ARCH_IOP33X

ARM system type
└─>IOP33x-based
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  
Support for Intel's IOP33X (XScale) family of processors.