default or selected kernelversion does not have config value CONFIG_SYSC_R8A7796.
Result is shown for kernelversion 6.9.9

R-Car M3-W System Controller support

modulename: r8a7796-sysc.ko

configname: CONFIG_SYSC_R8A7796

Linux Kernel Configuration
└─>Device Drivers
└─>SOC (System On Chip) specific Drivers
└─>R-Car M3-W System Controller support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
source code:
drivers/soc/renesas/r8a7796-sysc.c