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

CBE frequency scaling

modulename: cbe-cpufreq.ko

configname: CONFIG_CBE_CPUFREQ

Linux Kernel Configuration
└─>Cell Broadband Engine options
└─>CBE frequency scaling
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This adds the cpufreq driver for Cell BE processors.
For details, take a look at Documentation/cpu-freq/.
If you don't have such processor, say N

source code:
depends
CONFIG_CBE_RAS
CONFIG_CPU_FREQ
CONFIG_PPC_CELL