KVM: arm64: timer: Kill the per-timer irq level cache

The timer code makes use of a per-timer irq level cache, which
looks like a very minor optimisation to avoid taking a lock upon
updating the GIC view of the interrupt when it is unchanged from
the previous state.

This is coming in the way of more important correctness issues,
so get rid of the cache, which simplifies a couple of minor things.

Reviewed-by: Oliver Upton <oupton@kernel.org>
Link: https://patch.msgid.link/20260520100200.543845-4-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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