Added cascadeCount API to AdditionalLightData

Assets/ScriptableRenderPipeline/Core/AdditionalLightData.cs

         [HideInInspector, SerializeField] private ShadowData    shadowData;
         [HideInInspector, SerializeField] private ShadowData[]  shadowDatas = new ShadowData[0];
 
+        public int cascadeCount { get { return shadowCascadeCount; } }
         public void GetShadowCascades( out int cascadeCount, out float[] cascadeRatios ) { cascadeCount = shadowCascadeCount; cascadeRatios = shadowCascadeRatios; }
         public void GetShadowAlgorithm( out int algorithm, out int variant, out int precision )    { algorithm = shadowAlgorithm; variant = shadowVariant; precision = shadowPrecision; }
         public void SetShadowAlgorithm( int algorithm, int variant, int precision, int format, int[] data )

Assets/ScriptableRenderPipeline/Core/Shadow/Shadow.cs

                 float   distToCam       = (campos - lpos).magnitude;
                 bool    add             = (distToCam < ald.shadowFadeDistance || vl.lightType == LightType.Directional) && m_ShadowSettings.enabled;
 
-                float[] cascadeSplitsDummy = new float[3];
-
                 if( add )
                 {
                     switch( vl.lightType )
                             shadowType = GPUShadowType.Directional;
-                            ald.GetShadowCascades(out facecount, out cascadeSplitsDummy);
+                            facecount = ald.cascadeCount;
                             break;
                         case LightType.Point:
                             add = --m_MaxShadows[(int)GPUShadowType.Point, 0] >= 0;