mfd: max8925: Fix onkey driver irq base

update onkey driver's irq base, it should get from max8925,
but not save in a private value

Signed-off-by: Qing Xu <qingx@marvell.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/max8925-core.c b/drivers/mfd/max8925-core.c
index d7abbb3..f0cc402 100644
--- a/drivers/mfd/max8925-core.c
+++ b/drivers/mfd/max8925-core.c
@@ -867,7 +867,7 @@
 
 	ret = mfd_add_devices(chip->dev, 0, &onkey_devs[0],
 			      ARRAY_SIZE(onkey_devs),
-			      NULL, 0, NULL);
+			      NULL, chip->irq_base, NULL);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to add onkey subdev\n");
 		goto out_dev;