regulator: fan53555: fill set_voltage_time_set callback

Setting the set_voltage_time_sel callback to the standard function
regulator_set_voltage_time_sel enables the regulator to actually honor
ramp-delays when during regulator_set_voltage calls.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/fan53555.c b/drivers/regulator/fan53555.c
index 3c25db8..4286568 100644
--- a/drivers/regulator/fan53555.c
+++ b/drivers/regulator/fan53555.c
@@ -182,6 +182,7 @@
 static struct regulator_ops fan53555_regulator_ops = {
 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
 	.map_voltage = regulator_map_voltage_linear,
 	.list_voltage = regulator_list_voltage_linear,
 	.set_suspend_voltage = fan53555_set_suspend_voltage,