Power management fixes for v4.12-rc4

 - Make cpufreq_register_driver() return an error if the ->init()
   calls fail for all CPUs to prevent non-functional drivers from
   hanging around for no reason (David Arcari).

 - Make kirkwood-cpufreq check the return value of clk_prepare_enable()
   (which may fail) as appropriate (Arvind Yadav).
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