default or selected kernelversion does not have config value CONFIG_SND_SOC_SAMSUNG_LN2440SBC_ALC650.
Result is shown for kernelversion 6.5.1

SoC AC97 Audio support for LN2440SBC - ALC650

modulename: snd-soc-ln2440sbc-alc650.ko

configname: CONFIG_SND_SOC_SAMSUNG_LN2440SBC_ALC650

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC AC97 Audio support for LN2440SBC - ALC650
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Say Y if you want to add support for SoC audio on ln2440sbc
with the ALC650.

source code:
sound/soc//samsung/