default or selected kernelversion does not have config value CONFIG_GPIO_GENERIC_PLATFORM.
Result is shown for kernelversion 6.9-rc4
Generic memory-mapped GPIO controller support (MMIO platform device)
configname: CONFIG_GPIO_GENERIC_PLATFORM
Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>Memory mapped GPIO drivers
└─>Generic memory-mapped GPIO controller support (MMIO platform device)
In linux kernel since version 3.1 (release Date: 2011-10-24)
Say yes here to support basic platform_device memory-mapped GPIO controllers.