Temporarily remove vertex capability from Subgraphs

ShaderGraph/com.unity.shadergraph/Editor/Data/Nodes/Utility/SubGraphNode.cs

                 }
 
                 var id = prop.guid.GetHashCode();
-                MaterialSlot slot = MaterialSlot.CreateMaterialSlot(slotType, id, prop.displayName, prop.referenceName, SlotType.Input, prop.defaultValue);
+                MaterialSlot slot = MaterialSlot.CreateMaterialSlot(slotType, id, prop.displayName, prop.referenceName, SlotType.Input, prop.defaultValue, ShaderStageCapability.Fragment);
                 // copy default for texture for niceness
                 if (slotType == SlotValueType.Texture2D && propType == PropertyType.Texture)
                 {
             {
                 foreach (var slot in NodeExtensions.GetInputSlots<MaterialSlot>(subGraphOutputNode))
                 {
-                    AddSlot(MaterialSlot.CreateMaterialSlot(slot.valueType, slot.id, slot.RawDisplayName(), slot.shaderOutputName, SlotType.Output, Vector4.zero));
+                    AddSlot(MaterialSlot.CreateMaterialSlot(slot.valueType, slot.id, slot.RawDisplayName(), slot.shaderOutputName, SlotType.Output, Vector4.zero, ShaderStageCapability.Fragment));
                     validNames.Add(slot.id);
                 }
             }

ShaderGraph/com.unity.shadergraph/Editor/Data/SubGraph/SubGraph.cs

                     arguments.Add(string.Format("{0}", prop.GetPropertyAsArgumentString()));
 
                 // now pass surface inputs
-                arguments.Add("SurfaceInputs IN");
+                arguments.Add("SurfaceDescriptionInputs IN");
 
                 // Now generate outputs
                 foreach (var slot in graphOutputs)