default or selected kernelversion does not have config value CONFIG_SND_PXA2XX_SOC_TOSA.
Result is shown for kernelversion 6.9.9

SoC AC97 Audio support for Tosa

modulename: snd-soc-tosa.ko

configname: CONFIG_SND_PXA2XX_SOC_TOSA

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC AC97 Audio support for Tosa
In linux kernel since version 2.6.21.1 (release Date: 2007-04-27)  
Say Y if you want to add support for SoC audio on Sharp
Zaurus SL-C6000x models (Tosa).

source code:
sound/soc//pxa/