[SRU][PULL][OEM-OSP1-B] backport pmc_core

[Timo Aaltonen]

On 10.7.2019 11.10, AceLan Kao wrote:
> BugLink: https://bugs.launchpad.net/bugs/1836012
> 
> [Impact]
> The pmc_core interface /sys/kernel/debug/pmc_core/package_cstate_show
> indicates which PC state the system enterred. Currently, powertop can't
> show correct PC state, it only shows PC1 ~ PC3, so we need this interface
> to check the states.
> 
> [Fix]
> Backport pmc_core commits from upstream.

applied to osp1 oem-next, thanks


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