regulator: da9211: Add gpio control for enable/disable of buck

This is a patch for adding gpio control about enable/disable of buck.

Signed-off-by: James Ban <james.ban.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/linux/regulator/da9211.h b/include/linux/regulator/da9211.h
index d1d9d384..5dd65ac 100644
--- a/include/linux/regulator/da9211.h
+++ b/include/linux/regulator/da9211.h
@@ -32,6 +32,7 @@
 	 * 2 : 2 phase 2 buck
 	 */
 	int num_buck;
+	int gpio_ren[DA9211_MAX_REGULATORS];
 	struct device_node *reg_node[DA9211_MAX_REGULATORS];
 	struct regulator_init_data *init_data[DA9211_MAX_REGULATORS];
 };