Small fixes due to removal of vertex animation and transparent mode.

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Material/Lit/BaseLitUI.cs

 
             m_MaterialEditor.ShaderProperty(supportDBuffer, StylesBaseLit.supportDBufferText);
 
-            m_MaterialEditor.ShaderProperty(enableMotionVectorForVertexAnimation, StylesBaseUnlit.enableMotionVectorForVertexAnimationText);
+            if (enableMotionVectorForVertexAnimation != null)
+                m_MaterialEditor.ShaderProperty(enableMotionVectorForVertexAnimation, StylesBaseUnlit.enableMotionVectorForVertexAnimationText);
 
             EditorGUI.BeginChangeCheck();
             m_MaterialEditor.ShaderProperty(displacementMode, StylesBaseLit.displacementModeText);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Material/Lit/LitUI.cs

             }
             EditorGUI.indentLevel--;
 
-            var surfaceTypeValue = (SurfaceType)surfaceType.floatValue;
             if (surfaceTypeValue == SurfaceType.Transparent
                 && refractionModel != null)
             {

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Material/Unlit/BaseUnlitUI.cs

             enableMotionVectorForVertexAnimation = FindProperty(kEnableMotionVectorForVertexAnimation, props, false);
         }
 
-        SurfaceType surfaceTypeValue
+        protected SurfaceType surfaceTypeValue
         {
             get { return surfaceType != null ? (SurfaceType)surfaceType.floatValue : defaultSurfaceType; }
         }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/Terrain.shader

         [ToggleUI] _DisplacementLockTilingScale("displacement lock tiling scale", Float) = 1.0
         [ToggleUI] _DepthOffsetEnable("Depth Offset View space", Float) = 0.0
 
-        [ToggleUI] _EnableMotionVectorForVertexAnimation("EnableMotionVectorForVertexAnimation", Float) = 0.0
-
         _PPDMinSamples("Min sample for POM", Range(1.0, 64.0)) = 5
         _PPDMaxSamples("Max sample for POM", Range(1.0, 64.0)) = 15
         _PPDLodThreshold("Start lod to fade out the POM effect", Range(0.0, 16.0)) = 5