bnx2x: Use correct FW constant for header padding

the value of the constant is the same, but it's clearer to use original
constant provided by HSI
Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2x/bnx2x_cmn.c

@@ -831,7 +831,7 @@ void bnx2x_init_rx_rings(struct bnx2x *bp)
 	int i, j;
 
 	bp->rx_buf_size = bp->dev->mtu + ETH_OVREHEAD + BNX2X_RX_ALIGN +
-		BNX2X_FW_IP_HDR_ALIGN_PAD;
+		IP_HEADER_ALIGNMENT_PADDING;
 
 	DP(NETIF_MSG_IFUP,
 	   "mtu %d  rx_buf_size %d\n", bp->dev->mtu, bp->rx_buf_size);

drivers/net/bnx2x/bnx2x_cmn.h

@@ -1032,6 +1032,4 @@ static inline void storm_memset_cmng(struct bnx2x *bp,
 void bnx2x_acquire_phy_lock(struct bnx2x *bp);
 void bnx2x_release_phy_lock(struct bnx2x *bp);
 
-#define BNX2X_FW_IP_HDR_ALIGN_PAD	2 /* FW places hdr with this padding */
-
 #endif /* BNX2X_CMN_H */