default or selected kernelversion does not have config value CONFIG_BMI270_SPI.
Result is shown for kernelversion 6.6.75

Bosch BMI270 SPI driver

modulename: bmi270_spi.ko

configname: CONFIG_BMI270_SPI

Linux Kernel Configuration
└─>Device Drivers
└─>Industrial I/O support
└─>Inertial measurement units
└─>SPI support
└─>Bosch BMI270 SPI driver
In linux kernel since version 6.13 (release Date: 2025-01-19)  
Enable support for the Bosch BMI270 6-Axis IMU connected to SPI
interface.

This driver can also be built as a module. If so, the module will be
called bmi270_spi.

source code: