irqchip/gic_v3_mbi: Switch over to parent domain

The MBI chip creates two MSI domains:
    - PCI/MSI
    - Platform device domain

Both have the MBI domain as parent and differ slightly in the interrupt
chip callbacks and the platform device domain supports level type
signaling.

Convert it over to the MSI parent domain mechanism by:

   - Providing the required templates
   
   - Implementing a custom init_dev_msi_info() callback which sets the chip
     callbacks and the level support flags depending on the domain bus token
     type of the per device domain.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240623142235.455849114@linutronix.de