mv643xx_eth: remove unused DESC_SIZE define

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Dale Farnsworth <dale@farnsworth.org>

drivers/net/mv643xx_eth.c

@@ -162,8 +162,6 @@ static char mv643xx_driver_version[] = "1.0";
 #define PORT_DEFAULT_TRANSMIT_QUEUE_SIZE	800
 #define PORT_DEFAULT_RECEIVE_QUEUE_SIZE		400
 
-#define DESC_SIZE				64
-
 #define ETH_RX_QUEUES_ENABLED	(1 << 0)	/* use only Q0 for receive */
 #define ETH_TX_QUEUES_ENABLED	(1 << 0)	/* use only Q0 for transmit */