default or selected kernelversion does not have config value CONFIG_SYS_R9A09G057.
Result is shown for kernelversion 6.6.86

Renesas RZ/V2H System controller support

modulename: r9a09g057-sys.ko

configname: CONFIG_SYS_R9A09G057

Linux Kernel Configuration
└─>Device Drivers
└─>SOC (System On Chip) specific Drivers
└─>Renesas SoC driver support
└─>Renesas RZ/V2H System controller support
In linux kernel since version 6.6.86 (release Date: 2025-04-07)  
source code:
drivers/soc/renesas/r9a09g057-sys.c
selects
CONFIG_SYSC_RZ


is depended by
CONFIG_ARCH_R9A09G057