default or selected kernelversion does not have config value CONFIG_GPIO_IOP.
Result is shown for kernelversion 6.9.9

Intel IOP GPIO

modulename: gpio-iop.ko

configname: CONFIG_GPIO_IOP

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>Memory mapped GPIO drivers
└─>Intel IOP GPIO
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say yes here to support the GPIO functionality of a number of Intel
IOP32X or IOP33X series of chips.

If unsure, say N.

source code:

depends
CONFIG_GPIOLIB
CONFIG_HAS_IOMEM
CONFIG_ARCH_IOP32X or CONFIG_COMPILE_TEST

is depended by
CONFIG_ARCH_IOP32X