iommu/arm-smmu-v3: Start building a generic PASID layer

Add arm_smmu_set_pasid()/arm_smmu_remove_pasid() which are to be used by
callers that already constructed the arm_smmu_cd they wish to program.

These functions will encapsulate the shared logic to setup a CD entry that
will be shared by SVA and S1 domain cases.

Prior fixes had already moved most of this logic up into
__arm_smmu_sva_bind(), move it to it's final home.

Following patches will relieve some of the remaining SVA restrictions:

 - The RID domain is a S1 domain and has already setup the STE to point to
   the CD table
 - The programmed PASID is the mm_get_enqcmd_pasid()
 - Nothing changes while SVA is running (sva_enable)

SVA invalidation will still iterate over the S1 domain's master list,
later patches will resolve that.

Tested-by: Nicolin Chen <[email protected]>
Tested-by: Shameer Kolothum <[email protected]>
Reviewed-by: Nicolin Chen <[email protected]>
Reviewed-by: Jerry Snitselaar <[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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