CONFIG_CPU_SUBTYPE_SH7750 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
SH7750
modulename: setup-sh7750.ko
configname: CONFIG_CPU_SUBTYPE_SH7750
Processor subtype
└─>SH7750
In linux kernel since version 2.6.12
Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.