regulator: qcom-refgen: 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/qcom-refgen-regulator.c

···
 	return 1;
 }
 
-static struct regulator_desc sdm845_refgen_desc = {
+static const struct regulator_desc sdm845_refgen_desc = {
 	.enable_time = 5,
 	.name = "refgen",
 	.owner = THIS_MODULE,
···
 	},
 };
 
-static struct regulator_desc sm8250_refgen_desc = {
+static const struct regulator_desc sm8250_refgen_desc = {
 	.enable_reg = REFGEN_REG_PWRDWN_CTRL5,
 	.enable_mask = REFGEN_PWRDWN_CTRL5_MASK,
 	.enable_val = REFGEN_PWRDWN_CTRL5_ENABLE,