regulator: mc13892: Use regulator_map_voltage_ascend for mc13892_sw_regulator_ops

Both mc13892_sw1 and mc13892_sw voltage table have ascendant voltage list.
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/mc13892-regulator.c b/drivers/regulator/mc13892-regulator.c
index 9891aec..89d004b 100644
--- a/drivers/regulator/mc13892-regulator.c
+++ b/drivers/regulator/mc13892-regulator.c
@@ -485,6 +485,7 @@
 
 static struct regulator_ops mc13892_sw_regulator_ops = {
 	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
 	.set_voltage_sel = mc13892_sw_regulator_set_voltage_sel,
 	.get_voltage_sel = mc13892_sw_regulator_get_voltage_sel,
 };