perf/arm-cmn: Support CMN S3 r2

If you were disappointed at how minimal the initial CMN S3 support
looked compared to previous versions, then oh boy is it time to put your
party hats on... The biggest batch of incompatible changes yet comes not
with a new CMN product, but a point release of an existing one. We've
got new filters, loads of changes to existing events, register fields
moved around for no good reason, and much, much more! On the upside, we
do at least gain a means of working around the isolation feature.

As such, for the sake of sanity in the driver it is easiest to split it
into a distict "model" for our internal abstractions despite it bearing
the same part number as r0/r1.

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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