iommu/arm-smmu-v3: Expose the arm_smmu_attach interface

The arm-smmuv3-iommufd.c file will need to call these functions too.
Remove statics and put them in the header file. Remove the kunit
visibility protections from arm_smmu_make_abort_ste() and
arm_smmu_make_s2_domain_ste().

Reviewed-by: Nicolin Chen <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Reviewed-by: Jerry Snitselaar <[email protected]>
Reviewed-by: Mostafa Saleh <[email protected]>
Reviewed-by: Donald Dutile <[email protected]>
Tested-by: Nicolin Chen <[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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