iommu: Do not dereference fwnode in struct device

In order to make the underneath API easier to change in the future,
prevent users from dereferencing fwnode from struct device.
Instead, use the specific dev_fwnode() API for that.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20220801164758.20664-1-andriy.shevchenko@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iommu.c

@@ -173,7 +173,7 @@ int iommu_device_register(struct iommu_device *iommu,
 
 	iommu->ops = ops;
 	if (hwdev)
-		iommu->fwnode = hwdev->fwnode;
+		iommu->fwnode = dev_fwnode(hwdev);
 
 	spin_lock(&iommu_device_lock);
 	list_add_tail(&iommu->list, &iommu_device_list);