iommu: Consolidate the default_domain setup to one function

Make iommu_change_dev_def_domain() general enough to setup the initial
default_domain or replace it with a new default_domain. Call the new
function iommu_setup_default_domain() and make it the only place in the
code that stores to group->default_domain.

Consolidate the three copies of the default_domain setup sequence. The flow
flow requires:

 - Determining the domain type to use
 - Checking if the current default domain is the same type
 - Allocating a domain
 - Doing iommu_create_device_direct_mappings()
 - Attaching it to devices
 - Store group->default_domain

This adjusts the domain allocation from the prior patch to be able to
detect if each of the allocation steps is already the domain we already
have, which is a more robust version of what change default domain was
already doing.

Reviewed-by: Lu Baolu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Tested-by: Niklas Schnelle <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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