perf arm-spe: Save per CPU information in metadata

Save the Arm SPE information on a per-CPU basis. This approach is easier
in the decoding phase for retrieving metadata based on the CPU number of
every Arm SPE record.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Cc: Will Deacon <will@kernel.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Besar Wicaksono <bwicaksono@nvidia.com>
Cc: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20241003184302.190806-4-leo.yan@arm.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>