mfd: rk8xx-core: Constify struct regmap_irq_chip

The regmap_irq_chip structs are not modified and can be declared as
const to move their data to a read-only section.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240704-mfd-const-regmap_config-v2-12-0c8785b1331d@gmail.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/rk8xx-core.c

@@ -531,7 +531,7 @@ static const struct regmap_irq rk817_irqs[RK817_IRQ_END] = {
 	REGMAP_IRQ_REG_LINE(23, 8)
 };
 
-static struct regmap_irq_chip rk805_irq_chip = {
+static const struct regmap_irq_chip rk805_irq_chip = {
 	.name = "rk805",
 	.irqs = rk805_irqs,
 	.num_irqs = ARRAY_SIZE(rk805_irqs),
@@ -542,7 +542,7 @@ static struct regmap_irq_chip rk805_irq_chip = {
 	.init_ack_masked = true,
 };
 
-static struct regmap_irq_chip rk806_irq_chip = {
+static const struct regmap_irq_chip rk806_irq_chip = {
 	.name = "rk806",
 	.irqs = rk806_irqs,
 	.num_irqs = ARRAY_SIZE(rk806_irqs),
@@ -578,7 +578,7 @@ static const struct regmap_irq_chip rk816_irq_chip = {
 	.init_ack_masked = true,
 };
 
-static struct regmap_irq_chip rk817_irq_chip = {
+static const struct regmap_irq_chip rk817_irq_chip = {
 	.name = "rk817",
 	.irqs = rk817_irqs,
 	.num_irqs = ARRAY_SIZE(rk817_irqs),