CONFIG_DEBUG_R7S9210_SCIF4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Kernel low-level debugging messages via SCIF4 on R7S9210

configname: CONFIG_DEBUG_R7S9210_SCIF4

Kernel low-level debugging port
└─>Kernel low-level debugging messages via SCIF4 on R7S9210
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Say Y here if you want kernel low-level debugging support
via SCIF4 on Renesas RZ/A2M (R7S9210).