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

CONFIG_SH_CLK_CPG (not configurable)

modulename: cpg.ko

configname: CONFIG_SH_CLK_CPG

Linux Kernel Configuration
└─>System type
└─>Timer and clock configuration
└─>SH_CLK_CPG
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
source code:
drivers/sh/clk/cpg.c