KVM: arm64: GICv3: Handle LR overflow when EOImode==0

Now that we can identify interrupts that have not made it into the LRs,
it becomes relatively easy to use EOIcount to walk the overflow list.

What is a bit odd is that we compute a fake LR for the original
state of the interrupt, clear the active bit, and feed into the existing
logic for processing. In a way, this is what would have happened if
the interrupt was in an LR.

Tested-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Tested-by: Mark Brown <broonie@kernel.org>
Link: https://msgid.link/20251120172540.2267180-28-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>

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