iommu/arm-smmu-v3: Add a type for the CD entry

Instead of passing a naked __le16 * around to represent a CD table entry
wrap it in a "struct arm_smmu_cd" with an array of the correct size. This
makes it much clearer which functions will comprise the "CD API".

Tested-by: Nicolin Chen <[email protected]>
Tested-by: Shameer Kolothum <[email protected]>
Reviewed-by: Michael Shavit <[email protected]>
Reviewed-by: Moritz Fischer <[email protected]>
Reviewed-by: Nicolin Chen <[email protected]>
Reviewed-by: Mostafa Saleh <[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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