Revert "HDRenderPipeline: Fix issue with tessellation shadow and camera relative code"

This reverts commit 73e6ad6a524557e41947247fc1bb32c4ca3bfdef.

ScriptableRenderPipeline/HDRenderPipeline/ShaderVariablesFunctions.hlsl

     // Otherwise, depth comparisons become meaningless!
     float4x4 trViewMat = transpose(GetWorldToViewMatrix());
     float3   rotCamPos = trViewMat[3].xyz;
-    float3 viewPositionWS = mul((float3x3)trViewMat, -rotCamPos);
-    // When USE_LEGACY_UNITY_MATRIX_VARIABLES is define GetWorldToViewMatrix is absolute (because it use legacy unity matrix), but if not define it use our own variable that is camera relative.
-    #ifdef USE_LEGACY_UNITY_MATRIX_VARIABLES
-    return GetCameraRelativePositionWS(viewPositionWS);
-    #else
-    return viewPositionWS;
-    #endif
+    return mul((float3x3)trViewMat, -rotCamPos);
 #endif
 }