iommu/arm-smmu-v3: Add a global static IDENTITY domain

Move to the new static global for identity domains. Move all the logic out
of arm_smmu_attach_dev into an identity only function.

Reviewed-by: Michael Shavit <[email protected]>
Reviewed-by: Nicolin Chen <[email protected]>
Tested-by: Shameer Kolothum <[email protected]>
Tested-by: Nicolin Chen <[email protected]>
Tested-by: Moritz Fischer <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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