ixgbe: add new function to check for management presence

This patch adds a support function that will indicate for the
existence of management FW.

Signed-off-by: Donald C Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
Simple merge

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
Simple merge

diff --cc drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
Simple merge