CONFIG_CPM2 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Enable support for the CPM2 (Communications Processor Module)

modulename: cpm2.ko

and/or

pq2.ko

configname: CONFIG_CPM2

Linux Kernel Configuration
└─>Platform support
└─>Enable support for the CPM2 (Communications Processor Module)
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  
The CPM2 (Communications Processor Module) is a coprocessor on
embedded CPUs made by Freescale. Selecting this option means that
you wish to build a kernel for a machine with a CPM2 coprocessor
on it (826x, 827x, 8560).

source code:
/arch/powerpc/sysdev/