1, revert IMGINATION_NNA_SDK_ROOT usage in imgdnn_manager.cc

2, fix output scale attribute query in op_lite.cc

lite/backends/imagination_nna/imgdnn_manager.cc

@@ -368,8 +368,8 @@ imgdnn_network_object ImgdnnManager::createNetworkObject(
   const imgdnn_network_object_flags flags = 0;
 
   std::string options_str;
-  // std::string ddk_root{"/home/jasonwang/imgtools/ndk/main/"};
-  std::string ddk_root{STR2(IMAGINATION_NNA_SDK_ROOT)};
+  std::string ddk_root{"/home/jasonwang/imgtools/imagination_nna_sdk/"};
+  // std::string ddk_root{STR2(IMAGINATION_NNA_SDK_ROOT)};
   std::string hwconfig =
       ddk_root + "nna-tools/config/mirage_hw_config06_23_2_6500_301.json";
   std::string mapconfig = ddk_root + "nna-tools/config/mapconfig_q8a.json";