Created by: grygielski

Second part of https://github.com/PaddlePaddle/Paddle/pull/18942. Changes since Part1:

• deleted old code in graph_pattern_detector
• deleted old pass files
• improvements suggested by Sand3r-
• code introduced in https://github.com/PaddlePaddle/Paddle/pull/18988 has been adjusted to current mkldnn conv+activation pass code