CONFIG_ARCH_SH73A0 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SH-Mobile AG5 (R8A73A00)

modulename: setup-sh73a0.ko

and/or

clock-sh73a0.ko

configname: CONFIG_ARCH_SH73A0

Linux Kernel Configuration
└─>SH-Mobile AG5 (R8A73A00)
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:
/arch/arm/mach-shmobile/