i40e: Adds FCoE related code to i40e core driver

i40e: Adds FCoE related code to i40e core driver

Adds FCoE specific code to existing i40e core driver to:-

1. have separate FCoE VSI with additional FCoE queues pairs.
2. have FCoE related hash defines.
3. have additional FCoE related stats code.
4. export and then re-use existing functions required by FCoE build.

Signed-off-by: Vasu Dev <[email protected]>
Tested-by: Jack Morgan<[email protected]>
Signed-off-by: Aaron Brown <[email protected]>
Signed-off-by: David S. Miller <[email protected]>