Add hip* and roc* packages to nixpkgs, including Caffe and Tensorflow.

[alexanderkjeldaas]

Issue description

There are various packages that AMD has ported to ROCm or HIP available from the https://github.com/ROCmSoftwarePlatform github organization.

One test-application for ROCm support is the HIP-port of Caffe, a deep learning framework.

Caffe is already available as pkgs/applications/science/math/caffe/default.nix, but with optional CUDA backend.

https://github.com/ROCmSoftwarePlatform/hipCaffe

Other packages
https://github.com/ROCmSoftwarePlatform/rocBLAS
https://github.com/ROCmSoftwarePlatform/rocFFT
https://github.com/ROCmSoftwarePlatform/MIOpen
https://github.com/ROCmSoftwarePlatform/hiptensorflow

Steps to reproduce

Technical details

• System: (NixOS: nixos-version, Ubuntu/Fedora: lsb_release -a, ...)
• Nix version: (run nix-env --version)
• Nixpkgs version: (run nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion)
• Sandboxing enabled: (run grep build-use-sandbox /etc/nix/nix.conf)