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

ASoC support for Rockchip

configname: CONFIG_SND_SOC_ROCKCHIP

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>ASoC support for Rockchip
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y or M if you want to add support for codecs attached to
the Rockchip SoCs' Audio interfaces. You will also need to
select the audio interfaces to support below.