default or selected kernelversion does not have config value CONFIG_ATH6KL.
Result is shown for kernelversion 6.9-rc5

Atheros mobile chipsets support

modulename: ath6kl_core.ko

configname: CONFIG_ATH6KL

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Atheros mobile chipsets support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This module adds core support for wireless adapters based on
Atheros AR6003 and AR6004 chipsets. You still need separate
bus drivers for USB and SDIO to be able to use real devices.

If you choose to build it as a module, it will be called
ath6kl_core. Please note that AR6002 and AR6001 are not
supported by this driver.

source code: