iommu/vt-d: Split intel_iommu_enforce_cache_coherency()

First Stage and Second Stage have very different ways to deny
no-snoop. The first stage uses the PGSNP bit which is global per-PASID so
enabling requires loading new PASID entries for all the attached devices.

Second stage uses a bit per PTE, so enabling just requires telling future
maps to set the bit.

Since we now have two domain ops we can have two functions that can
directly code their required actions instead of a bunch of logic dancing
around use_first_level.

Combine domain_set_force_snooping() into the new functions since they are
the only caller.

Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lu Baolu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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