Similar to marking parent MSI domains it's required to identify per device
domains. Add flag and helpers.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NKevin Tian <kevin.tian@intel.com>
Acked-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124230313.747627287@linutronix.de