Unified device properties API for 3.18-rc1

Add support for retrieving device properties from the ACPI _DSD object
and introduce an API allowing device drivers to obtain the device
properties they need in a uniform way regardless of which mechanism
is available in the given system: ACPI _DSD or a Device Tree
(Mika Westerberg, Aaron Lu, Rafael J Wysocki, Darren Hart).

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