regulator: wm8994: Constify regulator_desc

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/wm8994-regulator.c b/drivers/regulator/wm8994-regulator.c
index 75ed402..8a4897a 100644
--- a/drivers/regulator/wm8994-regulator.c
+++ b/drivers/regulator/wm8994-regulator.c
@@ -209,7 +209,7 @@
 	.set_voltage = wm8994_ldo2_set_voltage,
 };
 
-static struct regulator_desc wm8994_ldo_desc[] = {
+static const struct regulator_desc wm8994_ldo_desc[] = {
 	{
 		.name = "LDO1",
 		.id = 1,