regulators: max8660: add DT bindings

This patch adds devicetree bindings for max8660, along with some
documentation.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/linux/regulator/max8660.h

@@ -39,7 +39,7 @@ enum {
  */
 struct max8660_subdev_data {
 	int				id;
-	char				*name;
+	const char			*name;
 	struct regulator_init_data	*platform_data;
 };