CONFIG_ARCH_R7S72100 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

RZ/A1H (R7S72100)

modulename: setup-r7s72100.ko

and/or

clock-r7s72100.ko

configname: CONFIG_ARCH_R7S72100

Linux Kernel Configuration
└─>RZ/A1H (R7S72100)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-shmobile/setup-r7s72100.c