KVM: arm64: vgic-its: Treat the collection target address as a vcpu_id

Since our emulated ITS advertises GITS_TYPER.PTA=0, the target
address associated to a collection is a PE number and not
an address. So far, so good. However, the PE number is what userspace
has provided given us (aka the vcpu_id), and not the internal vcpu
index.

Make sure we consistently retrieve the vcpu by ID rather than
by index, adding a helper that deals with most of the cases.

We also get rid of the pointless (and bogus) comparisons to
online_vcpus, which don't really make sense.

Reviewed-by: Zenghui Yu <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Oliver Upton <[email protected]>

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