default or selected kernelversion does not have config value CONFIG_AR9170_USB.
Result is shown for kernelversion 5.4.69

Atheros AR9170 802.11n USB support

modulename: ar9170usb.ko

configname: CONFIG_AR9170_USB

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Atheros Wireless Cards
└─>Atheros AR9170 802.11n USB support
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This is a driver for the Atheros "otus" 802.11n USB devices.

These devices require additional firmware (2 files).
For now, these files can be downloaded from here:

If you choose to build a module, it'll be called ar9170usb.

source code: