wasi-nn: Enable GPU support (#1922)

- Split logic in several dockers
  - runtime: wasi-nn-cpu and wasi-nn- Nvidia-gpu.
  - compilation: wasi-nn-compile. Prepare the testing wasm and generates the TFLites.
- Implement GPU support for TFLite with Opencl.

core/iwasm/libraries/wasi-nn/test/Dockerfile.nvidia-gpu

@@ -0,0 +1,20 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+FROM nvidia/cuda:11.3.0-runtime-ubuntu20.04
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        ocl-icd-libopencl1 \
+        ocl-icd-opencl-dev \
+        clinfo && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /etc/OpenCL/vendors && \
+    echo "libnvidia-opencl.so.1" > /etc/OpenCL/vendors/nvidia.icd
+
+ENV NVIDIA_VISIBLE_DEVICES=all
+ENV NVIDIA_DRIVER_CAPABILITIES=compute,utility
+
+COPY --from=wasi-nn-base /home/wamr/core/iwasm/libraries/wasi-nn/test/build/iwasm /run/iwasm
+
+ENTRYPOINT [ "/run/iwasm" ]