PCI: Add MSI masking quirk for Nvidia ION AHCI

The ION AHCI device pretends that MSI masking isn't a thing,
while it actually implements it and needs MSIs to be unmasked
to work. Add a quirk to that effect.

Reported-by: Rui Salvaterra <rsalvaterra@gmail.com>
Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/CALjTZvbzYfBuLB+H=fj2J+9=DxjQ2Uqcy0if_PvmJ-nU-qEgkg@mail.gmail.com
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