irqchip: exynos-combiner: Save IRQ enable set on suspend

The Exynos interrupt combiner IP loses its state when the SoC enters
into a low power state during a Suspend-to-RAM. This means that if a
IRQ is used as a source, the interrupts for the devices are disabled
when the system is resumed from a sleep state so are not triggered.

Save the interrupt enable set register for each combiner group and
restore it after resume to make sure that the interrupts are enabled.

Signed-off-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Kukjin Kim <[email protected]>
Cc: Tomasz Figa <[email protected]>
Cc: Doug Anderson <[email protected]>
Cc: [email protected]
Cc: Peter Chubb <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Chanho Park <[email protected]>
Cc: Sudeep Holla <[email protected]>
Link: http://lkml.kernel.org/r/1434087795-13990-1-git-send-email-javier.martinez@collabora.co.uk
Signed-off-by: Thomas Gleixner <[email protected]>

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