default or selected kernelversion does not have config value CONFIG_DWMAC_OXNAS.
Result is shown for kernelversion 6.9.5

Oxford Semiconductor OXNAS dwmac support

modulename: dwmac-oxnas.ko

configname: CONFIG_DWMAC_OXNAS

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Device Tree and Open Firmware support
└─>Oxford Semiconductor OXNAS dwmac support
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Support for Ethernet controller on Oxford Semiconductor OXNAS SoCs.

This selects the Oxford Semiconductor OXNASSoC glue layer support for
the stmmac device driver. This driver is used for OX820.

source code: