Merge pull request #1414 from Unity-Technologies/sg/fix-hd-lightmap

Fix HD subshader lightmap support

com.unity.render-pipelines.high-definition/HDRP/Editor/ShaderGraph/HDPBRSubShader.cs

             {
                 "FragInputs.worldToTangent",
                 "FragInputs.positionWS",
+                "FragInputs.texCoord1",
+                "FragInputs.texCoord2"
             },
             PixelShaderSlots = new List<int>()
             {