irqchip/aspeed-scu: Replace update_bits with write_bits.

The interrupt status bits are cleared by writing 1, we should force a
write to clear the interrupt without checking if the value has changed.

Fixes: 04f605906ff0 ("irqchip: Add Aspeed SCU interrupt controller")
Signed-off-by: Billy Tsai <[e-mail]>
Reviewed-by: Joel Stanley <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Cc: [e-mail]

drivers/irqchip/irq-aspeed-scu-ic.c

···
 		generic_handle_domain_irq(scu_ic->irq_domain,
 					  bit - scu_ic->irq_shift);
 
-		regmap_update_bits(scu_ic->scu, scu_ic->reg, mask,
-				   BIT(bit + ASPEED_SCU_IC_STATUS_SHIFT));
+		regmap_write_bits(scu_ic->scu, scu_ic->reg, mask,
+				  BIT(bit + ASPEED_SCU_IC_STATUS_SHIFT));
 	}
 
 	chained_irq_exit(chip, desc);