The enic driver fails to build on ARM with:
In file included from drivers/net/ethernet/cisco/enic/enic_res.c:40:0:
drivers/net/ethernet/cisco/enic/enic.h:48:2: error: expected specifier-qualifier-list before 'irqreturn_t'
  irqreturn_t (*isr)(int, void *);
  ^
Nothing in the driver 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>
 #include "vnic_stats.h"
 #include "vnic_nic.h"
 #include "vnic_rss.h"
+#include <linux/irq.h>
 
 #define DRV_NAME               "enic"
 #define DRV_DESCRIPTION                "Cisco VIC Ethernet NIC Driver"