google/kahlee: Enable IOMMU device

Enable the IOMMU device on all kahlee based mainboards.

BUG=b:116196614
TEST=Check dmesg for AMD-Vi messages.

Change-Id: I18b9ba1a970c6973226e736d72f82fd53010f31c
Signed-off-by: Marc Jones <marc.jones@scarletltd.com>
Reviewed-on: https://review.coreboot.org/28754
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kahlee/variants/aleena/devicetree.cb

@@ -55,6 +55,7 @@ chip soc/amd/stoneyridge
 	end
 	device domain 0 on
 		device pci 0.0 on  end # Root Complex
+		device pci 0.2 on  end # IOMMU
 		device pci 1.0 on  end # Internal Graphics P2P bridge 0x98e4
 		device pci 1.1 on  end # Internal Multimedia
 		device pci 2.0 on  end # PCIe Host Bridge

src/mainboard/google/kahlee/variants/careena/devicetree.cb

@@ -58,6 +58,7 @@ chip soc/amd/stoneyridge
 	end
 	device domain 0 on
 		device pci 0.0 on  end # Root Complex
+		device pci 0.2 on  end # IOMMU
 		device pci 1.0 on  end # Internal Graphics P2P bridge 0x98e4
 		device pci 1.1 on  end # Internal Multimedia
 		device pci 2.0 on  end # PCIe Host Bridge

src/mainboard/google/kahlee/variants/grunt/devicetree.cb

@@ -58,6 +58,7 @@ chip soc/amd/stoneyridge
 	end
 	device domain 0 on
 		device pci 0.0 on  end # Root Complex
+		device pci 0.2 on  end # IOMMU
 		device pci 1.0 on  end # Internal Graphics P2P bridge 0x98e4
 		device pci 1.1 on  end # Internal Multimedia
 		device pci 2.0 on  end # PCIe Host Bridge

src/mainboard/google/kahlee/variants/liara/devicetree.cb

@@ -55,6 +55,7 @@ chip soc/amd/stoneyridge
 	end
 	device domain 0 on
 		device pci 0.0 on  end # Root Complex
+		device pci 0.2 on  end # IOMMU
 		device pci 1.0 on  end # Internal Graphics P2P bridge 0x98e4
 		device pci 1.1 on  end # Internal Multimedia
 		device pci 2.0 on  end # PCIe Host Bridge