regulator: bd718x7: Use regulator_map_voltage_ascend for buck5 and buck7

The voltages in bd718xx_3rd_nodvs_buck_volts are in ascendant order, so use
regulator_map_voltage_ascend.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/bd718x7-regulator.c

@@ -130,6 +130,7 @@ static struct regulator_ops bd718xx_buck_regulator_nolinear_ops = {
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = bd718xx_set_voltage_sel_restricted,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_time_sel = regulator_set_voltage_time_sel,