message: Make DNNL1.2 default lib for MKL backend
diff: @@ -136,6 +136,7 @@ build --host_java_toolchain=//third_party/toolchains/java:tf_java_toolchain
  # environment variable "TF_MKL_ROOT" every time before build.
  build:mkl --define=build_with_mkl=true --define=enable_mkl=true
  build:mkl --define=tensorflow_mkldnn_contraction_kernel=0
  +build:mkl --define=build_with_mkl_dnn_v1_only=true
  build:mkl -c opt
  # This config option is used to enable MKL-DNN open source library only,
  