CONFIG_ARCH_R8A7744 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

RZ/G1N (R8A77440)

configname: CONFIG_ARCH_R8A7744

Linux Kernel Configuration
└─>Renesas ARM SoCs
└─>RZ/G1N (R8A77440)
In linux kernel since version 4.2 (release Date: 2015-08-30)