iommu: make the pointer to struct bus_type constant

A number of iommu functions take a struct bus_type * and never modify
the data passed in, so make them all const * as that is what the driver
core is expecting to have passed into as well.

This is a step toward making all struct bus_type pointers constant in
the kernel.

Cc: Will Deacon <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: [email protected]
Acked-by: Joerg Roedel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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