pcengines/apu2: enable IOMMU for all apu2 variants

IOMMU was tested on Xen 4.8 and Linux kernel 4.14.33. Following feature
set is enabled:
(XEN) AMD-Vi: Disabled HAP memory map sharing with IOMMU
(XEN) AMD-Vi: IOMMU Extended Features:
(XEN)  - Peripheral Page Service Request
(XEN)  - Guest Translation
(XEN)  - Invalidate All Command
(XEN)  - Guest APIC supported
(XEN)  - Performance Counters
(XEN) AMD-Vi: IOMMU 0 Enabled.

Change-Id: I6dbfae78849248f3532caa78974c8f2ce61a530d
Signed-off-by: Piotr Król <piotr.krol@3mdeb.com>
Reviewed-on: https://review.coreboot.org/26116
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/pcengines/apu2/variants/apu2/devicetree.cb b/src/mainboard/pcengines/apu2/variants/apu2/devicetree.cb
index 4f32064..2905e2c 100644
--- a/src/mainboard/pcengines/apu2/variants/apu2/devicetree.cb
+++ b/src/mainboard/pcengines/apu2/variants/apu2/devicetree.cb
@@ -25,7 +25,7 @@
 
 			chip northbridge/amd/pi/00730F01 # PCI side of HT root complex
 				device pci 0.0 on  end # Root Complex
-				device pci 0.2 off end # IOMMU
+				device pci 0.2 on end # IOMMU
 				device pci 1.0 off  end # Internal Graphics P2P bridge 0x9804
 				device pci 1.1 off  end # Internal Multimedia
 				device pci 2.0 on  end # PCIe Host Bridge
diff --git a/src/mainboard/pcengines/apu2/variants/apu3/devicetree.cb b/src/mainboard/pcengines/apu2/variants/apu3/devicetree.cb
index c431291..4da123e 100644
--- a/src/mainboard/pcengines/apu2/variants/apu3/devicetree.cb
+++ b/src/mainboard/pcengines/apu2/variants/apu3/devicetree.cb
@@ -25,7 +25,7 @@
 
 			chip northbridge/amd/pi/00730F01 # PCI side of HT root complex
 				device pci 0.0 on  end # Root Complex
-				device pci 0.2 off end # IOMMU
+				device pci 0.2 on end # IOMMU
 				device pci 1.0 off  end # Internal Graphics P2P bridge 0x9804
 				device pci 1.1 off  end # Internal Multimedia
 				device pci 2.0 on  end # PCIe Host Bridge
diff --git a/src/mainboard/pcengines/apu2/variants/apu4/devicetree.cb b/src/mainboard/pcengines/apu2/variants/apu4/devicetree.cb
index 9859255..b95afab 100644
--- a/src/mainboard/pcengines/apu2/variants/apu4/devicetree.cb
+++ b/src/mainboard/pcengines/apu2/variants/apu4/devicetree.cb
@@ -25,7 +25,7 @@
 
 			chip northbridge/amd/pi/00730F01 # PCI side of HT root complex
 				device pci 0.0 on  end # Root Complex
-				device pci 0.2 off end # IOMMU
+				device pci 0.2 on end # IOMMU
 				device pci 1.0 off  end # Internal Graphics P2P bridge 0x9804
 				device pci 1.1 off  end # Internal Multimedia
 				device pci 2.0 on  end # PCIe Host Bridge
diff --git a/src/mainboard/pcengines/apu2/variants/apu5/devicetree.cb b/src/mainboard/pcengines/apu2/variants/apu5/devicetree.cb
index 4bdaaaf..b5700f8 100644
--- a/src/mainboard/pcengines/apu2/variants/apu5/devicetree.cb
+++ b/src/mainboard/pcengines/apu2/variants/apu5/devicetree.cb
@@ -25,7 +25,7 @@
 
 			chip northbridge/amd/pi/00730F01 # PCI side of HT root complex
 				device pci 0.0 on  end # Root Complex
-				device pci 0.2 off end # IOMMU
+				device pci 0.2 on end # IOMMU
 				device pci 1.0 off  end # Internal Graphics P2P bridge 0x9804
 				device pci 1.1 off  end # Internal Multimedia
 				device pci 2.0 on  end # PCIe Host Bridge