default or selected kernelversion does not have config value CONFIG_GPIO_U300.
Result is shown for kernelversion 5.16-rc3

ST-Ericsson U300 COH 901 335/571 GPIO

configname: CONFIG_GPIO_U300

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>ST-Ericsson U300 COH 901 335/571 GPIO
In linux kernel since version 3.3 (release Date: 2012-03-18)  
Say yes here to support GPIO interface on ST-Ericsson U300.
The names of the two IP block variants supported are
COH 901 335 and COH 901 571/3. They contain 3, 5 or 7
ports of 8 GPIO pins each.