default or selected kernelversion does not have config value CONFIG_USB_EHCI_ATH79.
Result is shown for kernelversion 6.7-rc3

EHCI support for AR7XXX/AR9XXX SoCs (DEPRECATED)

configname: CONFIG_USB_EHCI_ATH79

Linux Kernel Configuration
└─>Device Drivers
└─>USB support
└─>EHCI support for AR7XXX/AR9XXX SoCs (DEPRECATED)
In linux kernel since version 3 (release Date: 2011-07-21)  
This option is deprecated now and the driver was removed, use
USB_EHCI_HCD_PLATFORM instead.

Enables support for the built-in EHCI controller present
on the Atheros AR7XXX/AR9XXX SoCs.