[GPU] Get output layout before getting padding of reshape

Author: kelvinchoi-intel

src/plugins/intel_gpu/src/graph/graph_optimizer/prepare_buffer_fusing.cpp

@@ -505,6 +505,7 @@ void prepare_buffer_fusing::run(program& p) {
                     return;
                 if (user->is_type<reshape>()) {
                     auto& reshape_node = user->as<reshape>();
+                    reshape_node.get_output_layout();
                     if (can_reshape_be_optimized(reshape_node))
                         return;
                 }