of/irq: Document properties for wakeup interrupt parent

Some interrupt controllers in a SoC, are always powered on and have a
select interrupts routed to them, so that they can wakeup the SoC from
suspend. Add wakeup-parent DT property to refer to these interrupt
controllers.

Signed-off-by: Lina Iyer <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Reviewed-by: Stephen Boyd <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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