ibcore: Add new IB rates.

Add the new rates that were added to Infiniband spec as part of
HDR and 2x support.

Linux commit:
a5a5d1993696419e7d5357fc3128e53d219d382e

Reviewed by: kib
Sponsored by: Mellanox Technologies // NVIDIA Networking

(cherry picked from commit 3d2fb36a9ce72053e8865852caad30044dbd1059)