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

CBE frequency scaling using PMI interface

configname: CONFIG_CBE_CPUFREQ_PMI_ENABLE

Linux Kernel Configuration
└─>Cell Broadband Engine options
└─>CBE frequency scaling using PMI interface
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Select this, if you want to use the PMI interface
to switch frequencies. Using PMI, the
processor will not only be able to run at lower speed,
but also at lower core voltage.

depends
CONFIG_CBE_CPUFREQ
CONFIG_EXPERIMENTAL
CONFIG_PPC_CELL