net: bnx2x: include irq.h for irqreturn_t definitions

The bnx2x driver fails to build on ARM with:

In file included from drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c:28:0:
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h:243:1: error: unknown type name 'irqreturn_t'
 irqreturn_t bnx2x_msix_sp_int(int irq, void *dev_instance);
 ^
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h:251:1: error: unknown type name 'irqreturn_t'
 irqreturn_t bnx2x_interrupt(int irq, void *dev_instance);
 ^

Nothing in bnx2x_link.c or bnx2x_cmn.h is explicitly including the irq
definitions, so we add an include of linux/irq.h to pick them up.
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h

@@ -21,6 +21,7 @@
 #include <linux/pci.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
+#include <linux/irq.h>
 
 #include "bnx2x.h"
 #include "bnx2x_sriov.h"