clk: at91: implement suspend/resume for the PMC irqchip

The irq line used by the PMC block is shared with several peripherals
including the init timer which is registering its handler with
IRQF_NO_SUSPEND.

Implement the appropriate suspend/resume callback for the PMC irqchip,
and inform irq core that PMC irq handler can be safely called while
the system is suspended by setting IRQF_COND_SUSPEND.

Signed-off-by: Boris Brezillon <[email protected]>
Reviewed-by: Alexandre Belloni <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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