regulator: lp872x: Use regulator_map_voltage_ascend

All regulators have ascendant voltage list in this driver.
Use regulator_map_voltage_ascend for them.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c
index 8e3c7ae..f5fc4a1 100644
--- a/drivers/regulator/lp872x.c
+++ b/drivers/regulator/lp872x.c
@@ -478,6 +478,7 @@
 
 static struct regulator_ops lp872x_ldo_ops = {
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.enable = regulator_enable_regmap,
@@ -488,6 +489,7 @@
 
 static struct regulator_ops lp8720_buck_ops = {
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = lp872x_buck_set_voltage_sel,
 	.get_voltage_sel = lp872x_buck_get_voltage_sel,
 	.enable = regulator_enable_regmap,
@@ -500,6 +502,7 @@
 
 static struct regulator_ops lp8725_buck_ops = {
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = lp872x_buck_set_voltage_sel,
 	.get_voltage_sel = lp872x_buck_get_voltage_sel,
 	.enable = regulator_enable_regmap,