kvm: selftests: aarch64: pass vgic_irq guest args as a pointer

The guest in vgic_irq gets its arguments in a struct. This struct used
to fit nicely in a single register so vcpu_args_set() was able to pass
it by value by setting x0 with it. Unfortunately, this args struct grew
after some commits and some guest args became random (specically
kvm_supports_irqfd).

Fix this by passing the guest args as a pointer (after allocating some
guest memory for it).

Signed-off-by: Ricardo Koller <[email protected]>
Reported-by: Reiji Watanabe <[email protected]>
Cc: Andrew Jones <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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