bna: Minor IRQ Index and Definition Change

Change details:
 - Always set mbox irq index to zero and make corresponding changes in mbox
   irq alloc/sync function and txrx irq index calculation. Add definition of
   BNAD_INTX_TX_IB_BITMASK & BNAD_INTX_RX_IB_BITMASK and update
   bnad_txrx_irq_alloc accordingly.

Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bna/bnad.h b/drivers/net/bna/bnad.h
index ea97060..458eb30 100644
--- a/drivers/net/bna/bnad.h
+++ b/drivers/net/bna/bnad.h
@@ -68,7 +68,10 @@
 
 #define BNAD_VERSION			"2.3.2.3"
 
+#define BNAD_MAILBOX_MSIX_INDEX		0
 #define BNAD_MAILBOX_MSIX_VECTORS	1
+#define BNAD_INTX_TX_IB_BITMASK		0x1
+#define BNAD_INTX_RX_IB_BITMASK		0x2
 
 #define BNAD_STATS_TIMER_FREQ		1000	/* in msecs */
 #define BNAD_DIM_TIMER_FREQ		1000	/* in msecs */