iommu/arm-smmu: Add pm_runtime/sleep ops

The smmu needs to be functional only when the respective
master's using it are active. The device_link feature
helps to track such functional dependencies, so that the
iommu gets powered when the master device enables itself
using pm_runtime. So by adapting the smmu driver for
runtime pm, above said dependency can be addressed.

This patch adds the pm runtime/sleep callbacks to the
driver and the corresponding bulk clock handling for all
the clocks needed by smmu.

Also, while we enable the runtime pm, add a pm sleep suspend
callback that pushes devices to low power state by turning
the clocks off in a system sleep.
Add corresponding clock enable path in resume callback as well.

Signed-off-by: Sricharan R <[email protected]>
Signed-off-by: Archit Taneja <[email protected]>
[Thor: Rework to get clocks from device tree]
Signed-off-by: Thor Thayer <[email protected]>
[vivek: rework for clock and pm ops]
Signed-off-by: Vivek Gautam <[email protected]>
Reviewed-by: Tomasz Figa <[email protected]>
Tested-by: Srinivas Kandagatla <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
Tested-by: Thor Thayer <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

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