regulator: pcf50633: Constify regulator_desc

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/pcf50633-regulator.c b/drivers/regulator/pcf50633-regulator.c
index 6db46c6..0f8ffed 100644
--- a/drivers/regulator/pcf50633-regulator.c
+++ b/drivers/regulator/pcf50633-regulator.c
@@ -285,7 +285,7 @@
 	.is_enabled = pcf50633_regulator_is_enabled,
 };
 
-static struct regulator_desc regulators[] = {
+static const struct regulator_desc regulators[] = {
 	[PCF50633_REGULATOR_AUTO] =
 		PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 81),
 	[PCF50633_REGULATOR_DOWN1] =