regulator: max77686: initialize of_node param for regulator register

Initialize config.of_node for regulator before registering.
This is needed for DT based regulator support.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/include/linux/mfd/max77686.h b/include/linux/mfd/max77686.h
index 3d7ae4d..46c0f32 100644
--- a/include/linux/mfd/max77686.h
+++ b/include/linux/mfd/max77686.h
@@ -74,6 +74,7 @@
 struct max77686_regulator_data {
 	int id;
 	struct regulator_init_data *initdata;
+	struct device_node *of_node;
 };
 
 enum max77686_opmode {