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Backport the below upstream "powernv-cpufreq" bug fixes to ubuntu 16.04:

The below listed patchset is accepted upstream and is in linux-next.

1) 86622cb8c57abb05fe95bea3a068949c0ca79fc3 cpufreq: powernv: Free 'chips' on module exit
2) 6d167a44e6c8da3316e037b788585fcf96112bea  cpufreq: powernv: Hot-plug safe the kworker thread
3) 96c4726f01cdbf53acf74cf2394e287d74bf40a3 cpufreq: powernv: Remove cpu_to_chip_id() from hot-path
4) 0306e481d479a58eff17c27adf213fbb5822946b cpufreq: powernv/tracing: Add powernv_throttle tracepoint
5)c89f2682a39192433c296bf97b834fd2815a758b cpufreq: powernv: Replace pr_info with trace print for throttle event

Two more patches that are posted upstream:
6) http://marc.info/?l=linuxppc-embedded&m=145648325218686&w=2
7) http://marc.info/?l=linux-pm&m=145648316718658&w=2

1) Fixes a memory leak
2) Makes the worker thread hot-plug safe which is scheduled on an OCC event.
3) Fixes the below bug which cause 4% cpu overhead by powernv_cpufreq_throttle_check() function.
     4.44%  [k] _raw_spin_lock_irqsave                                 
            |          
            |--48.56%-- _raw_spin_lock_irqsave
            |          |          
            |          |--72.55%-- of_find_property
            |          |          |          
            |          |          |--62.14%-- of_n_addr_cells
            |          |          |          __of_find_n_match_cpu_property
            |          |          |          |          
            |          |          |          |--75.72%-- of_get_cpu_node
            |          |          |          |          cpu_to_chip_id
            |          |          |          |          powernv_cpufreq_throttle_check
            |          |          |          |          powernv_cpufreq_target_index
            |          |          |          |          __cpufreq_driver_target
4) , 5) and 7) are permanent fixes for BZ 131119, BZ 130125 which complained on the throttle message reporting
6) Fixes bug in powernv_cpufreq_{init/exit}

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-137980 severity-high targetmilestone-inin1604
-- 
Backport upstream bugfixes to ubuntu-16.04
https://bugs.launchpad.net/bugs/1555765
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