CONFIG_CPU_SUBTYPE_SH7705 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

Support SH7705 processor

modulename: setup-sh7705.ko

configname: CONFIG_CPU_SUBTYPE_SH7705

Processor sub-type selection
└─>Support SH7705 processor
In linux kernel since version 2.6.12  
source code:
arch/sh/kernel/cpu/sh3/
selects
CONFIG_CPU_SH3

is selected by
CONFIG_SH_SOLUTION_ENGINE