regulator: wm8400: Fix trivial typo

Use WM8400_DC2_ENA_MASK for DCDC2 enable_mask.
The define is the same as WM8400_DC1_ENA_MASK, just a cleanup.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/wm8400-regulator.c

@@ -194,7 +194,7 @@ static struct regulator_desc regulators[] = {
 		.id = WM8400_DCDC2,
 		.ops = &wm8400_dcdc_ops,
 		.enable_reg = WM8400_DCDC2_CONTROL_1,
-		.enable_mask = WM8400_DC1_ENA_MASK,
+		.enable_mask = WM8400_DC2_ENA_MASK,
 		.n_voltages = WM8400_DC2_VSEL_MASK + 1,
 		.vsel_reg = WM8400_DCDC2_CONTROL_1,
 		.vsel_mask = WM8400_DC2_VSEL_MASK,