of/irq: Add of_msi_xlate() helper function

Add an of_msi_xlate() helper that maps a device ID and returns
the device node of the MSI controller the device ID is mapped to.

Required by core functions that need an MSI controller device node
pointer at the same time as a mapped device ID, of_msi_map_id() is not
sufficient for that purpose.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250703-gicv5-host-v7-24-12e71f1b3528@kernel.org


Signed-off-by: Marc Zyngier <maz@kernel.org>