BACKPORT: FROMLIST: iommu/arm-smmu-v3-kvm: Implement sg operations

Implement the new map_sg ops which mainly populate the kvm_iommu_sg
and pass it in the hypervisor.

Link: https://lore.kernel.org/all/20241212180423.1578358-58-smostafa@google.com/



Bug: 357781595
Bug: 384432312

Change-Id: I68d5ed71e222900e38a2212661c425b4dde2444d
Signed-off-by: Mostafa Saleh <smostafa@google.com>