default or selected kernelversion does not have config value CONFIG_SND_BF5XX_SOC_AC97.
Result is shown for kernelversion 6.7-rc3

CONFIG_SND_BF5XX_SOC_AC97 (not configurable)

modulename: snd-soc-bf5xx-ac97.ko

configname: CONFIG_SND_BF5XX_SOC_AC97

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SND_BF5XX_SOC_AC97
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
source code: