default or selected kernelversion does not have config value CONFIG_SOC_CAMERA_OV9640.
Result is shown for kernelversion 6.9.9

ov9640 camera support

modulename: ov9640.ko

configname: CONFIG_SOC_CAMERA_OV9640

Linux Kernel Configuration
└─>Device Drivers
└─>Multimedia support
└─>Sensors used on soc_camera driver
└─>ov9640 camera support
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
This is a ov9640 camera driver

source code: