default or selected kernelversion does not have config value CONFIG_SND_SOC_RT721_SDCA_SDW.
Result is shown for kernelversion 6.6.75

Realtek RT721 SDCA Codec - SDW

modulename: snd-soc-rt721-sdca.ko

configname: CONFIG_SND_SOC_RT721_SDCA_SDW

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>CODEC drivers
└─>Realtek RT721 SDCA Codec - SDW
In linux kernel since version 6.13 (release Date: 2025-01-19)  
source code:
sound/soc//codecs/