regulator: mp8865: add set_voltage_time_sel func

support delay time in microseconds required to
rise or fall to this new voltage

Change-Id: I8d096500a3dcb376785285d08228961cf6b26ce0
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>

Author: Elaine Zhang

drivers/regulator/mp8865-regulator.c

@@ -93,6 +93,7 @@ static struct regulator_ops mp8865_dcdc_ops = {
 	.map_voltage = regulator_map_voltage_linear_range,
 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 	.set_voltage_sel = mp8865_set_voltage,
+	.set_voltage_time_sel = regulator_set_voltage_time_sel,
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,