CONFIG_CPU_SUBTYPE_SH73180 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

SH73180

configname: CONFIG_CPU_SUBTYPE_SH73180

Processor subtype
└─>SH73180
In linux kernel since version 2.6.12  
selects

CONFIG_CPU_SH4A

depends
CONFIG_CPU_SH4