default or selected kernelversion does not have config value CONFIG_AGNX.
Result is shown for kernelversion 5.15.31

Wireless Airgo AGNX support

modulename: agnx.ko

configname: CONFIG_AGNX

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Wireless Airgo AGNX support
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
This is an experimental driver for Airgo AGNX00 wireless chip.

source code:
drivers/staging/agnx/