RDMA/nes: Fix SFP+ PHY initialization

SFP+ PHY initialization has very long delays, incorrect settings for
direct attach copper cables, and inconsistent link detection.

Adjust delays to the minimum required by the PHY.  Worst case is now
less than 4 seconds.  Add new register settings for direct attach
cables.  Change link detection logic to use two new registers for more
consistent link state detection.  Reorganize code to shorten line
length.
Signed-off-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>