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

CAIF HSI transport driver

modulename: caif_hsi.ko

configname: CONFIG_CAIF_HSI

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>CAIF HSI transport driver
In linux kernel since version 3.1 (release Date: 2011-10-24)  
The caif low level driver for CAIF over HSI.
Be aware that if you enable this then you also need to
enable a low-level HSI driver.

source code: