default or selected kernelversion does not have config value CONFIG_KEYBOARD_CAP1106.
Result is shown for kernelversion 5.2.15

Microchip CAP1106 touch sensor

modulename: cap1106.ko

configname: CONFIG_KEYBOARD_CAP1106

Linux Kernel Configuration
└─>Device Drivers
└─>Input device support
└─>Microchip CAP1106 touch sensor
In linux kernel since version 3.17 (release Date: 2014-10-05)  
Say Y here to enable the CAP1106 touch sensor driver.

To compile this driver as a module, choose M here: the
module will be called cap1106.

source code: