Add rocHPL and OSU microbenchmarks
Adding package descriptions from our internal guix channel (joint with @x-KHauge): adds rocHPL and OSU microbenchmarks, and all associated library dependencies.
This MR also makes some modifications to the description for open-mpi, namely adding rocm-enabled libfabric support which should support the cassini nic for the slingshot-11 network. This topic warrants some discussion that we should sync on.