default or selected kernelversion does not have config value CONFIG_SND_ML403_AC97CR.
Result is shown for kernelversion 6.9.9

Xilinx ML403 AC97 Controller Reference

modulename: snd-ml403-ac97cr.ko

configname: CONFIG_SND_ML403_AC97CR

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>Generic sound devices
└─>Xilinx ML403 AC97 Controller Reference
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
Say Y here to include support for the
opb_ac97_controller_ref_v1_00_a ip core found in Xilinx's ML403
reference design.

To compile this driver as a module, choose M here: the module
will be called snd-ml403_ac97cr.

source code: