bnx2: Don't redefine FLOW_CTRL_{RX,TX}.

They are provided generically by linux/mii.h now.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.h

@@ -6848,9 +6848,6 @@ struct bnx2 {
 	u8			flow_ctrl;	/* actual flow ctrl settings */
 						/* may be different from     */
 						/* req_flow_ctrl if autoneg  */
-#define FLOW_CTRL_TX		1
-#define FLOW_CTRL_RX		2
-
 	u32			advertising;
 
 	u8			req_flow_ctrl;	/* flow ctrl advertisement */