mfd: atc260x: Replace irqchip mask_invert with unmask_base

Remove use of the deprecated mask_invert flag. Inverted mask
registers (where a '1' bit enables an IRQ) can be described more
directly as an unmask register.
Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221112151835.39059-3-aidanmacdonald.0x0@gmail.com

drivers/mfd/atc260x-core.c

@@ -100,8 +100,7 @@ static const struct regmap_irq_chip atc2603c_regmap_irq_chip = {
 	.num_irqs = ARRAY_SIZE(atc2603c_regmap_irqs),
 	.num_regs = 1,
 	.status_base = ATC2603C_INTS_PD,
-	.mask_base = ATC2603C_INTS_MSK,
-	.mask_invert = true,
+	.unmask_base = ATC2603C_INTS_MSK,
 };
 
 static const struct regmap_irq_chip atc2609a_regmap_irq_chip = {
@@ -110,8 +109,7 @@ static const struct regmap_irq_chip atc2609a_regmap_irq_chip = {
 	.num_irqs = ARRAY_SIZE(atc2609a_regmap_irqs),
 	.num_regs = 1,
 	.status_base = ATC2609A_INTS_PD,
-	.mask_base = ATC2609A_INTS_MSK,
-	.mask_invert = true,
+	.unmask_base = ATC2609A_INTS_MSK,
 };
 
 static const struct resource atc2603c_onkey_resources[] = {