irqchip/gic: Document optional Clock and Power Domain properties

Depending on the GIC variant, the GIC module has one or more clock
inputs. Document the optional "clocks" and "clock-names" properties,
and their possible values, based on the Technical Reference Manuals.
optional.

Add the optional "power-domains" property.

This will allow to describe in DT the relationship between the GIC and
the Clock and/or Power Domain topology on SoCs where this is relevant
and needed for proper operation.

Note: As the current GIC driver doesn't support Runtime PM yet, PM
Domain constraints must be handled elsewhere in e.g. platform code.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Acked-by: Rob Herring <[email protected]>
Cc: [email protected]
Cc: Pawel Moll <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Ian Campbell <[email protected]>
Link: http://lkml.kernel.org/r/1442261204-30931-3-git-send-email-geert%[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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