lp3971: Fix setting val for LDO2 and LDO4

In lp3971_ldo_set_voltage function, it requires val to left shift 4
bits for LDO2 and LDO4.
This patch fix this issue.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/lp3971.c

@@ -187,7 +187,8 @@ static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
 		return -EINVAL;
 
 	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
-		LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), val);
+			LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
+			val << LDO_VOL_CONTR_SHIFT(ldo));
 }
 
 static struct regulator_ops lp3971_ldo_ops = {