regulator: mtk-dvfsrc: Constify static data

Driver does not modify static data with regulator description (struct
regulator_desc), so make it const for code safety.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/mtk-dvfsrc-regulator.c

···
 };
 
 struct dvfsrc_regulator_pdata {
-	struct regulator_desc *descs;
+	const struct regulator_desc *descs;
 	u32 size;
 };
 
···
 	725000,
 };
 
-static struct regulator_desc mt6873_regulators[] = {
+static const struct regulator_desc mt6873_regulators[] = {
 	MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt6873_voltages),
 	MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt6873_voltages),
 };
···
 	800000,
 };
 
-static struct regulator_desc mt8183_regulators[] = {
+static const struct regulator_desc mt8183_regulators[] = {
 	MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8183_voltages),
 };
 
···
 	750000,
 };
 
-static struct regulator_desc mt8195_regulators[] = {
+static const struct regulator_desc mt8195_regulators[] = {
 	MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8195_voltages),
 	MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt8195_voltages),
 };
···
 		return -EINVAL;
 
 	for (i = 0; i < pdata->size; i++) {
-		struct regulator_desc *vrdesc = &pdata->descs[i];
+		const struct regulator_desc *vrdesc = &pdata->descs[i];
 		struct regulator_dev *rdev;
 
 		rdev = devm_regulator_register(&pdev->dev, vrdesc, &config);