nb/amd/pi/00730F01: assign IOMMU ops in chipset devicetree

Since the IOMMU is always function 2 of device 0 on bus 0, the device
operations can be statically assigned in the devicetree and there's no
need to bind the IOMMU device operations to the PCI device during
runtime via a list of PCI IDs.

TEST=PC Engines APU2 still boots and doesn't show any new problems

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I84e949500ee86e0fcb2d15791502f5e3e7127703
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79105
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/amd/pi/00730F01/chipset.cb

@@ -10,7 +10,9 @@ chip northbridge/amd/pi/00730F01
 		device pci 0.0 alias gnb			on
 			ops amd_pi_northbridge_ops
 		end
-		device pci 0.2 alias iommu			off end
+		device pci 0.2 alias iommu			off
+			ops amd_pi_iommu_ops
+		end
 		device pci 1.0 alias gfx			off end
 		device pci 1.1 alias gfx_hda			off end
 		device pci 2.0					on  end # Dummy device function, do not disable

src/northbridge/amd/pi/00730F01/iommu.c

@@ -21,15 +21,9 @@ static void iommu_read_resources(struct device *dev)
 	res->flags = IORESOURCE_MEM;
 }
 
-static struct device_operations iommu_ops = {
+struct device_operations amd_pi_iommu_ops = {
 	.read_resources = iommu_read_resources,
 	.set_resources = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.ops_pci = &pci_dev_ops_pci,
 };
-
-static const struct pci_driver iommu_driver __pci_driver = {
-	.ops = &iommu_ops,
-	.vendor = PCI_VID_AMD,
-	.device = PCI_DID_AMD_16H_MODEL_303F_NB_IOMMU,
-};