default or selected kernelversion does not have config value CONFIG_PINCTRL_MMP2.
Result is shown for kernelversion 5.4.159

MMP2 pin controller driver

modulename: pinctrl-mmp2.ko

configname: CONFIG_PINCTRL_MMP2

Linux Kernel Configuration
└─>Device Drivers
└─>Pin controllers
└─>MMP2 pin controller driver
In linux kernel since version 3.4 (release Date: 2012-05-20)  
source code:
drivers/pinctrl/pinctrl-mmp2.c