perf/arm-ni: Support sharing IRQs within an NI instance

NI-700 has a distinct PMU interrupt output for each Clock Domain,
however some integrations may still combine these together externally.
The initial driver didn't attempt to support this, in anticipation of a
more general solution for IRQ sharing between system PMU instances, but
that's still a way off, so let's make this intermediate step for now to
at least allow sharing IRQs within an individual NI instance.

Now that CPU affinity and migration are cleaned up, it's fairly
straightforward to adopt similar logic to arm-cmn, to identify CDs with
a common interrupt and loop over them directly in the handler.

Signed-off-by: Shouping Wang <[email protected]>
[ rm: Rework for affinity handling, cosmetics, new commit message ]
Signed-off-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/f62db639d3b54c959ec477db7b8ccecbef1ca310.1752256072.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <[email protected]>

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