CONFIG_ARCH_R8A7793 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

R-Car M2-N (R8A7793)

modulename: regulator-quirk-rcar-gen2.ko

configname: CONFIG_ARCH_R8A7793

Linux Kernel Configuration
└─>Renesas ARM SoCs
└─>R-Car M2-N (R8A7793)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code: