Fix Light Probe node

- Update function to latest SRP library
- Add missing function for preview rendering

com.unity.shadergraph/Editor/Data/Nodes/Input/Scene/LightProbeNode.cs

             return
                 @"
 {
-    Out = ShadeSH9(float4(Normal , 1));
+    Out = SampleSH(Normal);
 }
 ";
         }

com.unity.shadergraph/ShaderGraphLibrary/ShaderVariablesFunctions.hlsl

     #define UNITY_Z_0_FAR_FROM_CLIPSPACE(coord) (coord)
 #endif
 
+half3 SampleSH(half3 normalWS)
+{
+    // LPPV is not supported in Ligthweight Pipeline
+    real4 SHCoefficients[7];
+    SHCoefficients[0] = unity_SHAr;
+    SHCoefficients[1] = unity_SHAg;
+    SHCoefficients[2] = unity_SHAb;
+    SHCoefficients[3] = unity_SHBr;
+    SHCoefficients[4] = unity_SHBg;
+    SHCoefficients[5] = unity_SHBb;
+    SHCoefficients[6] = unity_SHC;
+
+    return max(half3(0, 0, 0), SampleSH9(SHCoefficients, normalWS));
+}
+
 #endif // UNITY_SHADER_VARIABLES_FUNCTIONS_INCLUDED