mfd: sec: Fix IRQ domain names duplication

For the S2MPG10 IRQ and chained IRQ, regmap IRQ will try to create a
folder with the same name which is impossible and fails with:

  debugfs: ':firmware:power-management:pmic' already exists in 'domains'

Add domain_suffix to the chained IRQ chip driver to fix it.

Fixes: ee19b52 ("mfd: sec: Use chained IRQs for s2mpg10")
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20260105-s2mpg10-chained-irq-domain-suffix-v1-1-01ab16204b97@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>

Author: andred

drivers/mfd/sec-irq.c

@@ -198,6 +198,7 @@ static const struct regmap_irq_chip s2mpg10_irq_chip = {
 
 static const struct regmap_irq_chip s2mpg10_irq_chip_pmic = {
 	.name = "s2mpg10-pmic",
+	.domain_suffix = "pmic",
 	.status_base = S2MPG10_PMIC_INT1,
 	.mask_base = S2MPG10_PMIC_INT1M,
 	.num_regs = 6,