soc/amd/{cezanne,common}: Enable IOMMU PCIe Device

This change only enables the IOMMU device. We still require the IVRS
table to take advantage of the IOMMU. This will happen when the picasso
IVRS code is moved into common.

BUG=b:190515051
TEST=lspci shows IOMMU device
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 1631

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I5c7cae3d25af5a45d48658ffa948a2856adc4346
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55737
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/mainboard/google/guybrush/variants/baseboard/devicetree.cb

@@ -186,6 +186,8 @@ chip soc/amd/cezanne
 	}"
 
 	device domain 0 on
+		device ref iommu on end
+
 		device ref gpp_bridge_0 on
 			chip drivers/wifi/generic
 				register "wake" = "GEVENT_8"

src/soc/amd/cezanne/Kconfig

@@ -47,6 +47,7 @@ config SOC_SPECIFIC_OPTIONS
 	select SOC_AMD_COMMON_BLOCK_GRAPHICS
 	select SOC_AMD_COMMON_BLOCK_HAS_ESPI
 	select SOC_AMD_COMMON_BLOCK_I2C
+	select SOC_AMD_COMMON_BLOCK_IOMMU
 	select SOC_AMD_COMMON_BLOCK_LPC
 	select SOC_AMD_COMMON_BLOCK_LPC_SPI_DMA
 	select SOC_AMD_COMMON_BLOCK_NONCAR

src/soc/amd/common/block/iommu/iommu.c

@@ -42,6 +42,7 @@ static const unsigned short pci_device_ids[] = {
 	PCI_DEVICE_ID_AMD_15H_MODEL_303F_NB_IOMMU,
 	PCI_DEVICE_ID_AMD_15H_MODEL_707F_NB_IOMMU,
 	PCI_DEVICE_ID_AMD_17H_MODEL_1020_NB_IOMMU,
+	PCI_DEVICE_ID_AMD_17H_MODEL_606F_NB_IOMMU,
 	0
 };