mfd: tps65086: Constify struct regmap_irq_chip

`tps65086_irq_chip` is not modified and can be declared as const to
move its 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-v2-15-0c8785b1331d@gmail.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/tps65086.c

@@ -45,7 +45,7 @@ static const struct regmap_irq tps65086_irqs[] = {
 	REGMAP_IRQ_REG(TPS65086_IRQ_FAULT, 0, TPS65086_IRQ_FAULT_MASK),
 };
 
-static struct regmap_irq_chip tps65086_irq_chip = {
+static const struct regmap_irq_chip tps65086_irq_chip = {
 	.name = "tps65086",
 	.status_base = TPS65086_IRQ,
 	.mask_base = TPS65086_IRQ_MASK,