irqchip/imx-mu-msi: Convert to msi_create_parent_irq_domain() helper

irqchip/imx-mu-msi: Convert to msi_create_parent_irq_domain() helper

Now that we have a concise helper to create an MSI parent domain,
switch the IMX letter soup over to that.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Nam Cao <tglx@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/all/4f05fff99b6cc5875d2f4dadd31707e2dedaafc8.1750860131.git.namcao@linutronix.de
Link: https://lore.kernel.org/all/20241204124549.607054-7-maz@kernel.org