RDMA/usnic: Use device_iommu_capable()

Use the new interface to check the capability for our device
specifically.

Link: https://lore.kernel.org/r/96ffe7050da0aa0ad6bce4705c3532f3ecaf32e3.1654688682.git.robin.murphy@arm.com
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/usnic/usnic_uiom.c

@@ -482,7 +482,7 @@ int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev)
 	if (err)
 		goto out_free_dev;
 
-	if (!iommu_capable(dev->bus, IOMMU_CAP_CACHE_COHERENCY)) {
+	if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
 		usnic_err("IOMMU of %s does not support cache coherency\n",
 				dev_name(dev));
 		err = -EINVAL;