regulator: s2mps11: Don't check enable_shift before setting enable ramp rate

Current code misses updating the register when enable_shift is 0.
e.g. S2MPS11_BUCK9_RAMP_SHIFT and S2MPS11_BUCK6_RAMP_EN_SHIFT are 0.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/s2mps11.c

@@ -202,14 +202,12 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 	if (!ramp_enable)
 		goto ramp_disable;
 
-	if (enable_shift) {
 	ret = regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
 				 1 << enable_shift, 1 << enable_shift);
 	if (ret) {
 		dev_err(&rdev->dev, "failed to enable ramp rate\n");
 		return ret;
 	}
-	}
 
 	ramp_val = get_ramp_delay(ramp_delay);