HDRenderPipeline: Disable allowHDR on camera with HDAdditionalData

ScriptableRenderPipeline/HDRenderPipeline/Camera/HDAdditionalCameraData.cs

     public class HDAdditionalCameraData : MonoBehaviour
     {
         public RenderingPathHDRP renderingPath;
+
+        Camera m_camera;
+
+        void OnEnable()
+        {
+            // Be sure legacy HDR option is disable on camera as it cause banding in SceneView. Yes, it is a contradiction, but well, Unity...
+            // When HDR option is enabled, Unity render in FP16 then convert to 8bit with a stretch copy (this cause banding as it should be convert to sRGB (or other color appropriate color space)), then do a final shader with sRGB conversion
+            // When LDR, unity render in 8bitSRGB, then do a final shader with sRGB conversion 
+            // What should be done is just in our Post process we convert to sRGB and store in a linear 10bit, but require C++ change...
+            m_camera = GetComponent<Camera>();
+            m_camera.allowHDR = false;
+        }
     }
 }