default or selected kernelversion does not have config value CONFIG_ARCH_R9A09G057.
Result is shown for kernelversion 6.10-rc4

ARM64 Platform support for RZ/V2H(P)

configname: CONFIG_ARCH_R9A09G057

Linux Kernel Configuration
└─>Device Drivers
└─>SOC (System On Chip) specific Drivers
└─>Renesas SoC driver support
└─>ARM64 Platform support for RZ/V2H(P)
This enables support for the Renesas RZ/V2H(P) SoC variants.