staging/rdma/hfi1: Support external device configuration requests from 8051

This patch implements support for turning on and off the clock data
recovery mechanisms implemented in QSFP cable on request by the DC 8051
on a per-lane basis.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>