CONFIG_CPU_SUBTYPE_SH7750S is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

Support SH7750S processor

modulename: setup-sh7750.ko

configname: CONFIG_CPU_SUBTYPE_SH7750S

Processor sub-type selection
└─>Support SH7750S processor
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
source code:
selects
CONFIG_CPU_SH4

is selected by
CONFIG_SH_SOLUTION_ENGINE