default or selected kernelversion does not have config value CONFIG_EASYCAP_SND.
Result is shown for kernelversion 5.6.18

ALSA

configname: CONFIG_EASYCAP_SND

Sound Interface
└─>Advanced Linux Sound Architecture
└─>ALSA
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
Say 'Y' if you want to use ALSA interface

This will disable Open Sound System (OSS) binding.

selects
CONFIG_SND_PCM

depends
CONFIG_SND