CONFIG_CPU_SUBTYPE_SH7734 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

Support SH7734 processor

modulename: setup-sh7734.ko

configname: CONFIG_CPU_SUBTYPE_SH7734

Processor sub-type selection
└─>Support SH7734 processor
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Select SH7734 if you have a SH4A SH7734 CPU.

source code:
arch/sh/kernel/cpu/sh4a/setup-sh7734.c