regulator: vexpress: Constify regulator_ops

vexpress_regulator_ops_ro and vexpress_regulator_ops are never changed,
make them const.
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/regulator/vexpress-regulator.c

@@ -46,11 +46,11 @@ static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
 	return regmap_write(reg->regmap, 0, min_uV);
 }
 
-static struct regulator_ops vexpress_regulator_ops_ro = {
+static const struct regulator_ops vexpress_regulator_ops_ro = {
 	.get_voltage = vexpress_regulator_get_voltage,
 };
 
-static struct regulator_ops vexpress_regulator_ops = {
+static const struct regulator_ops vexpress_regulator_ops = {
 	.get_voltage = vexpress_regulator_get_voltage,
 	.set_voltage = vexpress_regulator_set_voltage,
 };