default or selected kernelversion does not have config value CONFIG_SND_ES968.
Result is shown for kernelversion 5.4.194

Generic ESS ES968 driver

modulename: snd-es968.ko

configname: CONFIG_SND_ES968

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ISA sound devices
└─>Plug and Play support
└─>Generic ESS ES968 driver
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Say Y here to include support for ESS AudioDrive ES968 chips.

To compile this driver as a module, choose M here: the module
will be called snd-es968.

source code: