perf/arm-cmn: Refactor event filter data

The ABI hole I have dug myself into requires the driver to know which
event encodings are associated with which particular filter control.
Since we will soon have a notion of multiple filters per event, refactor
the event data to encapsulate filters in an explicit structure, which
can then more easily scale as an array in future.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: Will Deacon <will@kernel.org>

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