Add hwloc for OpenMPI enablement

**What I'd like:**
`nvbandwidth` uses `hwloc-ls` to bind to the correct memory for Open MPI workloads. To get the best performance, this should be available in the OS for EC2 instances like P6e-GB200.36xlarge.

**Any alternatives you've considered:**
Not adding this allows the tool to "fall back" to the less performant method without binding to shared memory.