regulator: sc2731: Constify regulators

The regulators array should never need to be modified, make it const so
compiler can put it to .rodata.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/sc2731-regulator.c

@@ -146,7 +146,7 @@ static const struct regulator_ops sc2731_regu_linear_ops = {
 	.vsel_mask		= vmask,			\
 }
 
-static struct regulator_desc regulators[] = {
+static const struct regulator_desc regulators[] = {
 	SC2731_REGU_LINEAR(BUCK_CPU0, SC2731_POWER_PD_SW,
 			   SC2731_DCDC_CPU0_PD_MASK, SC2731_DCDC_CPU0_VOL,
 			   SC2731_DCDC_CPU0_VOL_MASK, 3125, 400000, 1996875),