CONFIG_CPU_SH2 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

CONFIG_CPU_SH2 (not configurable)

configname: CONFIG_CPU_SH2

Linux/SuperH Kernel Configuration
└─>System type
└─>CPU_SH2
In linux kernel since version 2.6.12  
selects

CONFIG_SH_INTC

is selected by
CONFIG_SH_JCORE_SOC