regulator: lp3972: 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/lp3972.c b/drivers/regulator/lp3972.c
index 49a15ee..2e48621 100644
--- a/drivers/regulator/lp3972.c
+++ b/drivers/regulator/lp3972.c
@@ -471,7 +471,7 @@
 	.set_voltage = lp3972_dcdc_set_voltage,
 };
 
-static struct regulator_desc regulators[] = {
+static const struct regulator_desc regulators[] = {
 	{
 		.name = "LDO1",
 		.id = LP3972_LDO1,