ixgbe: delete one duplicate marcro definition of IXGBE_MAX_L2A_QUEUES

There is typo in ixgbe.h, two marcro definition of IXGBE_MAX_L2A_QUEUES to 4,
delete one, clear the compiler warning.
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe.h

@@ -307,7 +307,6 @@ enum ixgbe_ring_f_enum {
 #define MAX_RX_QUEUES (IXGBE_MAX_FDIR_INDICES + 1)
 #define MAX_TX_QUEUES (IXGBE_MAX_FDIR_INDICES + 1)
 #define IXGBE_MAX_L2A_QUEUES 4
-#define IXGBE_MAX_L2A_QUEUES 4
 #define IXGBE_BAD_L2A_QUEUE 3
 #define IXGBE_MAX_MACVLANS	31
 #define IXGBE_MAX_DCBMACVLANS	8