be2net: Changes to update ethtool get_settings function to return appropriate values.

Update ethtool get_settings function to:
- get current link speed settings from controller
- get port transceiver type from controller
- fill appropriate values for supported, phy_address

Signed-off-by: Sarveshwar Bandi <sarveshwarb@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>