regulator: max8649 Convert max8649 to use regmap api

Signed-off-by: Jonghwan Choi <jhbird.choi@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 9713b1b..4e919b2 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -93,6 +93,7 @@
 config REGULATOR_MAX8649
 	tristate "Maxim 8649 voltage regulator"
 	depends on I2C
+	select REGMAP_I2C
 	help
 	  This driver controls a Maxim 8649 voltage output regulator via
 	  I2C bus.