cxgb4 : Update fw interface file for DCBx support. Adds all the required...

cxgb4 : Update fw interface file for DCBx support. Adds all the required fields to fw interface to communicate DCBx info

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>