CONFIG_ARCH_IOP32X is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

IOP32x-based

modulename: pmu.ko

and/or

pci.ko

and/or

irq.ko

and/or

setup.ko

and/or

i2c.ko

and/or

restart.ko

and/or

adma.ko

and/or

cp6.ko

and/or

time.ko

configname: CONFIG_ARCH_IOP32X

ARM system type
└─>IOP32x-based
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  
Support for Intel's 80219 and IOP32X (XScale) family of
processors.

source code:
arch/arm/plat-iop/i2c.c

depends
CONFIG_MMU or CONFIG_ARCH_MULTI_V5 |
| CONFIG_ATAGS or CONFIG_CPU_LITTLE_ENDIAN or CONFIG_UNUSED_BOARD_FILES