PCI/MSI: Size device MSI domain with the maximum number of vectors

Zenghui reports that since 1396e89e09f0 ("genirq/msi: Move prepare() call
to per-device allocation"), his Multi-MSI capable device isn't working
anymore.

This is a consequence of 15c72f824b32 ("PCI/MSI: Add support for per device
MSI[X] domains"), which always creates a MSI domain of size 1, even in the
presence of Multi-MSI.

While this was somehow working until then, moving the .prepare() call ends
up sizing the ITS table with a tiny value for this device, and making the
endpoint driver unhappy.

Instead, always create the domain and call the .prepare() helper with the
maximum expected size.

Fixes: 1396e89e09f0 ("genirq/msi: Move prepare() call to per-device allocation")
Fixes: 15c72f824b32 ("PCI/MSI: Add support for per device MSI[X] domains")
Reported-by: Zenghui Yu <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Zenghui Yu <[email protected]>
Reviewed-by: Lorenzo Pieralisi <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
Closes: https://lore.kernel.org/r/[email protected]

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