genirq/msi: Provide DOMAIN_BUS_WIRED_TO_MSI

Provide a domain bus token for the upcoming support for wire to MSI device
domains so the domain can be distinguished from regular device MSI domains.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240127161753.114685-10-apatel@ventanamicro.com