default or selected kernelversion does not have config value CONFIG_W90P910_ETH.
Result is shown for kernelversion 6.9.9

Nuvoton w90p910 Ethernet support

modulename: w90p910_ether.ko

configname: CONFIG_W90P910_ETH

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Nuvoton w90p910 Ethernet support
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
Say Y here if you want to use built-in Ethernet ports
on w90p910 processor.

source code: