genirq/msi: Engage the .msi_teardown() callback on domain removal

Kindly inform the MSI driver that the domain is torn down, providing the
allocation context previously populated on domain creation.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250513163144.2215824-5-maz@kernel.org