irqdomain: Introduce irq_create_fwspec_mapping

Just like we have irq_create_of_mapping, irq_create_fwspec_mapping
creates a IRQ domain mapping for an interrupt described in a
struct irq_fwspec.

irq_create_of_mapping gets rewritten in terms of the new function,
and the hack we introduced before gets removed (now that no stacked
irqchip uses of_phandle_args anymore).

Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-and-tested-by: Hanjun Guo <[email protected]>
Tested-by: Lorenzo Pieralisi <[email protected]>
Cc: <[email protected]>
Cc: Tomasz Nowicki <[email protected]>
Cc: Suravee Suthikulpanit <[email protected]>
Cc: Graeme Gregory <[email protected]>
Cc: Jake Oshins <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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