iommu/amd: Convert to msi_create_parent_irq_domain() helper

iommu/amd: Convert to msi_create_parent_irq_domain() helper

Now that we have a concise helper to create an MSI parent domain,
switch the AMD IOMMU remapping 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>
Link: https://lore.kernel.org/all/20241204124549.607054-9-maz@kernel.org
Link: https://lore.kernel.org/r/92e5ae97a03e4ffc272349d0863cd2cc8f904c44.1750858125.git.namcao@linutronix.de
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>