ixgbe: Add link management support for E610 device

Add low level link management support for E610 device. Link management
operations are handled via the Admin Command Interface. Add the following
link management operations:
- get link capabilities
- set up link
- get media type
- get link status, link status events
- link power management

Co-developed-by: Stefan Wegrzyn <[email protected]>
Signed-off-by: Stefan Wegrzyn <[email protected]>
Co-developed-by: Jedrzej Jagielski <[email protected]>
Signed-off-by: Jedrzej Jagielski <[email protected]>
Reviewed-by: Jan Glaza <[email protected]>
Tested-by: Bharath R <[email protected]>
Signed-off-by: Piotr Kwapulinski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

Author: pkwapuli