default or selected kernelversion does not have config value CONFIG_PINCTRL_SUN6I_A31S.
Result is shown for kernelversion 6.4.14

CONFIG_PINCTRL_SUN6I_A31S (not configurable)

modulename: pinctrl-sun6i-a31s.ko

configname: CONFIG_PINCTRL_SUN6I_A31S

Linux Kernel Configuration
└─>Device Drivers
└─>Pin controllers
└─>PINCTRL_SUN6I_A31S
In linux kernel since version 4 (release Date: 2015-04-12)  
source code:
drivers/pinctrl/sunxi/pinctrl-sun6i-a31s.c