iommu: Remove iommu_register_instance interface

And also move its remaining functionality to
iommu_device_register() and 'struct iommu_device'.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/msm_iommu.c

@@ -810,8 +810,6 @@ static int msm_iommu_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
-	of_iommu_set_ops(pdev->dev.of_node, &msm_iommu_ops);
-
 	pr_info("device mapped at %p, irq %d with %d ctx banks\n",
 		iommu->base, iommu->irq, iommu->ncb);