iommu/ipmmu-vmsa: Call arm_iommu_release_mapping() in release path

In the iommu driver's release_device operation, the driver should detach
the device from any attached domain and release the resources allocated
in the probe_device and probe_finalize paths.

Replace arm_iommu_detach_device() with arm_iommu_release_mapping() in the
release path of the ipmmu-vmsa driver. The device_release callback is
called in device_del(), this device is not coming back. Zeroing out
pointers and testing for a condition which cannot be true by construction
is simply a waste of time and code.

The bonus is that it also removes a obstacle of arm_iommu_detach_device()
re-entering the iommu core during release_device. With this removed, the
iommu core code could be simplified a lot.

Signed-off-by: Jason Gunthorpe <[email protected]>
Suggested-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/linux-iommu/[email protected]/
Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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