irqchip/GICv2m: Get rid of struct msi_controller

GICv2m only uses the msi_controller structure as a way to match
the host bridge with its MSI HW, and thus the msi_domain.

But now that we can directly associate an msi_domain with a device,
there is no use keeping this msi_controller around.

Just remove all traces of msi_controller from the driver. Also
tag the inner (non-PCI) domain with DOMAIN_BUS_NEXUS.

Signed-off-by: Marc Zyngier <[email protected]>
Cc: <[email protected]>
Cc: Yijing Wang <[email protected]>
Cc: Ma Jun <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Duc Dang <[email protected]>
Cc: Hanjun Guo <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Jiang Liu <[email protected]>
Cc: Jason Cooper <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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