CONFIG_ARCH_R8A7740 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

R-Mobile A1 (R8A77400)

modulename: pm-r8a7740.ko

and/or

entry-intc.ko

and/or

armadillo800eva.ko

and/or

setup-r8a7740.ko

configname: CONFIG_ARCH_R8A7740

Linux Kernel Configuration
└─>R-Mobile A1 (R8A77400)
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
/arch/arm/mach-shmobile/