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

CONFIG_CPU_SH2 (not configurable)

modulename: cache-sh2.ko

configname: CONFIG_CPU_SH2

Linux Kernel Configuration
└─>CPU_SH2
In linux kernel since version 2.6.12  
source code:
arch/sh/mm/cache-sh2.c
selects

CONFIG_SH_INTC