CONFIG_ARCH_R7S9210 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

RZ/A2 (R7S9210)

modulename: setup-r7s9210.ko

configname: CONFIG_ARCH_R7S9210

Linux Kernel Configuration
└─>Renesas ARM SoCs
└─>RZ/A2 (R7S9210)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-shmobile/setup-r7s9210.c