Merge back cpufreq material for 3.19-rc1.

Documentation/cpu-freq/intel-pstate.txt

Documentation/kernel-parameters.txt

arch/x86/include/asm/cpufeature.h

arch/x86/include/uapi/asm/msr-index.h

arch/x86/kernel/cpu/scattered.c

drivers/cpufreq/Kconfig

drivers/cpufreq/Makefile

drivers/cpufreq/cpufreq-dt.c

drivers/cpufreq/cpufreq.c

drivers/cpufreq/intel_pstate.c

drivers/cpufreq/ls1x-cpufreq.c

drivers/cpufreq/pcc-cpufreq.c