Power management and ACPI fixes for v4.2-rc5

 - Fix a recently introduced issue in the cpufreq core causing
   it to attempt to create duplicate symbolic links to the policy
   directory in sysfs for CPUs that are offline when the cpufreq
   driver is being registered (Rafael J Wysocki).

 - Fix a recently introduced problem in the ACPI device power
   management core code causing it to store an incorrect value
   in the device object's power.state field in some cases which
   in turn leads to attempts to turn power resources off while
   they should still be on going forward (Mika Westerberg).

 - Fix an intel_pstate driver issue introduced during the 4.1 cycle
   which leads to kernel panics on boot on Knights Landing chips due
   to incomplete support for them in that driver (Lukasz Anaczkowski).

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