mb/prodrive/hermes: Disable xDCI

The PCI device is used for debugging only and as Windows 10 has no
default driver for it, disable it to not scare end users about "missing"
drivers.

Change-Id: I0b42a9b55f00826c5920c1c259b38382bdcdde72
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42509
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/prodrive/hermes/devicetree.cb b/src/mainboard/prodrive/hermes/devicetree.cb
index 45bd422..c55ac92 100644
--- a/src/mainboard/prodrive/hermes/devicetree.cb
+++ b/src/mainboard/prodrive/hermes/devicetree.cb
@@ -21,7 +21,7 @@
 		device pci 08.0 on  end # Gaussian Mixture
 		device pci 12.0 on  end # Thermal Subsystem
 		device pci 14.0 on  end # USB xHCI
-		device pci 14.1 on  end # USB xDCI (OTG)
+		device pci 14.1 off end # USB xDCI (OTG)
 		device pci 14.2 on  end # RAM controller
 		device pci 14.5 off end # SDCard