BACKPORT: FROMLIST: iommu/arm-smmu-v3-kvm: Enable runtime PM

Enable runtime PM for the KVM SMMUv3 driver. The PM link to DMA masters
dictates when the SMMU should be powered on.

Link: https://lore.kernel.org/all/20241212180423.1578358-55-smostafa@google.com/



Bug: 357781595
Bug: 384432312

Change-Id: I54cc1ef0970f87ee6a8d18a6b79872c67b624837
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>