iommu/arm-smmu-v3: Consolidate clearing a CD table entry

A cleared entry is all 0's. Make arm_smmu_clear_cd() do this sequence.

If we are clearing an entry and for some reason it is not already
allocated in the CD table then something has gone wrong.

Remove case (5) from arm_smmu_write_ctx_desc().

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