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

Atheros AR9170 802.11n USB support (OBSOLETE)

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 (OBSOLETE)

This driver is going to get replaced by carl9170.

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: