CONFIG_DEBUG_S3C_PORT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_DEBUG_S3C_PORT.
Result is shown for kernelversion 5.3.7

Kernel low-level debugging messages via S3C UART

configname: CONFIG_DEBUG_S3C_PORT

Linux Kernel Configuration
└─>Kernel hacking
└─>Kernel low-level debugging messages via S3C UART
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
Say Y here if you want debug print routines to go to one of the
S3C internal UARTs. The chosen UART must have been configured
before it is used.