[patch] Create a new device_pm.{c|h} for internal use

[Richard Hughes]

Attached patch abstracts out initial code for sharing between the acpi,
pmu and (future) device batteries.

This can't just be put into util_pm as it relies on HalDevice, which we
can't use in addons and probers. It's also needed for other cleanup
patches I'll need for power_supply device class device.

Okay to commit?

Thanks,

Richard.

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