soc/amd/*: Hook up IOMMU ops in devicetree

This removed the need to maintain a PCI driver.

Change-Id: I43def81d615749008fcc9de8734fa2aca752aa9d
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68146
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
diff --git a/src/soc/amd/mendocino/chipset_rembrandt.cb b/src/soc/amd/mendocino/chipset_rembrandt.cb
index c0472c5..170b44c 100644
--- a/src/soc/amd/mendocino/chipset_rembrandt.cb
+++ b/src/soc/amd/mendocino/chipset_rembrandt.cb
@@ -5,7 +5,7 @@
 	device domain 0 on
 		ops mendocino_pci_domain_ops
 		device pci 00.0 alias gnb on ops mendocino_root_complex_operations end
-		device pci 00.2 alias iommu off end
+		device pci 00.2 alias iommu off ops amd_iommu_ops end
 
 		device pci 01.0 on end # Dummy Host Bridge