PM / devfreq: stopping the governor before device_unregister()

device_release() is freeing the resources before calling the device
specific release callback which is, in the case of devfreq, stopping
the governor.

It is a problem as some governors are using the device resources. e.g.
simpleondemand which is using the devfreq deferrable monitoring work. If it
is not stopped before the resources are freed, it might lead to a use after
free.

Signed-off-by: Vincent Donnefort <[email protected]>
Reviewed-by: John Einar Reitan <[email protected]>
[cw00.choi: Fix merge conflict]
Reviewed-by: Chanwoo Choi <[email protected]>
Signed-off-by: MyungJoo Ham <[email protected]>

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