mfd: rt5120: 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/20221112151835.39059-14-aidanmacdonald.0x0@gmail.com

drivers/mfd/rt5120.c

@@ -59,9 +59,8 @@ static const struct regmap_irq rt5120_irqs[] = {
 static const struct regmap_irq_chip rt5120_irq_chip = {
 	.name = "rt5120-pmic",
 	.status_base = RT5120_REG_INTSTAT,
-	.mask_base = RT5120_REG_INTENABLE,
+	.unmask_base = RT5120_REG_INTENABLE,
 	.ack_base = RT5120_REG_INTSTAT,
-	.mask_invert = true,
 	.use_ack = true,
 	.num_regs = 1,
 	.irqs = rt5120_irqs,