remove now unused individual LandData prim counts.

However, the calls to the land management module to record prims need to remain, since they were also being used to return owner object lists, etc.
This is probably why prim counts were being done there in the first place.

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -1427,20 +1427,6 @@ namespace OpenSim.Region.Framework.Scenes
             );
         }
 
-        /// <summary>
-        /// Recount SceneObjectPart in parcel aabb
-        /// </summary>
-        private void UpdateLand()
-        {
-            if (LandChannel != null)
-            {
-                if (LandChannel.IsLandPrimCountTainted())
-                {
-                    EventManager.TriggerParcelPrimCountUpdate();
-                }
-            }
-        }
-
         /// <summary>
         /// Update the terrain if it needs to be updated.
         /// </summary>