staging/rdma/hfi1: Reduce syslog message severity and provide speed information

The syslog message causes unnecessary alarm for the single and dual port
x8 cards by reporting at an error level. This patch reduces the severity
to informational only and adds speed information.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>