devmodel: add parentassigngrp

Signed-off-by: Christoph Ostarek <christoph@zededa.com>

proto/config/devmodel.proto

@@ -153,6 +153,15 @@ message PhysicalIO {
   // list of Virtual Functions (VF) for given Physical Function (PF)
   // only applies for PHY_IO_TYPE_PHY_IO_NET_ETH_PF
   VfList vflist = 9;
+
+  // parentassigngrp
+  //
+  // Parent Assignment Group is there to reference the parent assignment group in order to make the device
+  // dependent on a different device.
+  // Currently the concrete reason to do this is to make a usb device dependent on the PCI address the USB
+  // controller is using to provent passthrough of the USB controller in one application while trying to passthrough
+  // a USB device on this controller to another application.
+  string  parentassigngrp         = 10;
 }
 
 message VfList {