default or selected kernelversion does not have config value CONFIG_BMI270.
Result is shown for kernelversion 6.6.75

CONFIG_BMI270 (not configurable)

modulename: bmi270_core.ko

configname: CONFIG_BMI270

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Inertial measurement units
└─>BMI270
In linux kernel since version 6.13 (release Date: 2025-01-19)  
source code: