regulator: Fix s5m8767_set_voltage_time_sel calculation value

In the s5m8767_set_voltage_time_sel function, divisor unit is wrong.
ramp_delay is usec unit. So 1000 should be multiplied.
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/regulator/s5m8767.c

@@ -457,7 +457,7 @@ static int s5m8767_set_voltage_time_sel(struct regulator_dev *rdev,
 
 	if (old_sel < new_sel)
 		return DIV_ROUND_UP(desc->step * (new_sel - old_sel),
-					s5m8767->ramp_delay);
+					s5m8767->ramp_delay * 1000);
 	return 0;
 }