v2.0.0-rocm

Tensorflow-rocm-v2.0.0 whl package code base with ROCm2.9.

ROCm early release 0.1

Pass "\$ORIGIN" to ROCm crosstool to preserve "$ORIGIN" at link time

This commit removes LD_LIBRARY_PATH env var previously required on ROCm
platform.

Further commit need to improve logic here so it's only applied when
TensorFlow is configured to be built on ROCm platform. Right now the commit applies to all environments.