default or selected kernelversion does not have config value CONFIG_SND_LOONGSON1_AC97.
Result is shown for kernelversion 6.16-rc7

Loongson1 AC97 Support

modulename: loongson1_ac97.ko

configname: CONFIG_SND_LOONGSON1_AC97

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Loongson1 AC97 Support
In linux kernel since version 6.1.145 (release Date: 2025-07-14)  
Say Y or M if you want to add support for codecs attached to
the Loongson1 AC97 controller.

source code:
sound/soc//loongson/loongson1_ac97.c