iommu/tegra: gart: Move bus_set_iommu after probe for multi arch

For a single image to support multiple SoCs(GART/SMMU).

Reported-by: Arto Merilainen <amerilainen@nvidia.com>
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

drivers/iommu/tegra-gart.c

@@ -398,6 +398,7 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	do_gart_setup(gart, NULL);
 
 	gart_handle = gart;
+	bus_set_iommu(&platform_bus_type, &gart_iommu_ops);
 	return 0;
 
 fail:
@@ -450,7 +451,6 @@ static struct platform_driver tegra_gart_driver = {
 
 static int __devinit tegra_gart_init(void)
 {
-	bus_set_iommu(&platform_bus_type, &gart_iommu_ops);
 	return platform_driver_register(&tegra_gart_driver);
 }