CONFIG_CPU_SUBTYPE_SH7707 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

Support SH7707 processor

modulename: setup-sh770x.ko

configname: CONFIG_CPU_SUBTYPE_SH7707

Processor sub-type selection
└─>Support SH7707 processor
In linux kernel since version 2.6.12  
Select SH7707 if you have a 60 Mhz SH-3 HD6417707 CPU.

source code:
selects
CONFIG_CPU_SH3