regulator: mc13892: add device tree probe support

It adds device tree probe support for mc13892-regulator driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/include/linux/mfd/mc13xxx.h b/include/linux/mfd/mc13xxx.h
index 3816c2f..a98e2a3 100644
--- a/include/linux/mfd/mc13xxx.h
+++ b/include/linux/mfd/mc13xxx.h
@@ -69,6 +69,7 @@
 struct mc13xxx_regulator_init_data {
 	int id;
 	struct regulator_init_data *init_data;
+	struct device_node *node;
 };
 
 struct mc13xxx_regulator_platform_data {