mfd: pm8xxx-irq: Set unique dev id for sys device

Use device id passed from platform data to register
for sysfs.

Signed-off-by: Jay Chokshi <jchokshi@codeaurora.org>

Conflicts:

	drivers/mfd/pm8xxx-irq.c
diff --git a/include/linux/mfd/pm8xxx/irq.h b/include/linux/mfd/pm8xxx/irq.h
index 4b21769..4e2570c 100644
--- a/include/linux/mfd/pm8xxx/irq.h
+++ b/include/linux/mfd/pm8xxx/irq.h
@@ -31,6 +31,7 @@
 	struct pm8xxx_irq_core_data	irq_cdata;
 	int				devirq;
 	int				irq_trigger_flag;
+	int				dev_id;
 };
 
 struct pm_irq_chip;