default or selected kernelversion does not have config value CONFIG_I2C_STU300.
Result is shown for kernelversion 6.9.9

ST Microelectronics DDC I2C interface

modulename: i2c-stu300.ko

configname: CONFIG_I2C_STU300

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>I2C Hardware Bus support
└─>ST Microelectronics DDC I2C interface
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
If you say yes to this option, support will be included for the
I2C interface from ST Microelectronics simply called "DDC I2C"
supporting both I2C and DDC, used in e.g. the U300 series
mobile platforms.

This driver can also be built as a module. If so, the module
will be called i2c-stu300.

source code: