perf arm: Workaround ARM PMUs cpu maps having offline cpus

When PMUs have a cpu map in the 'cpus' or 'cpumask' file, perf will
try to open events on those CPUs. ARM doesn't remove offline CPUs
meaning taking a CPU offline will cause perf commands to fail unless a
CPU map is passed on the command line.

More context in:
https://lore.kernel.org/lkml/[email protected]/

Reported-by: Yicong Yang <[email protected]>
Closes: https://lore.kernel.org/lkml/[email protected]/
Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Yicong Yang <[email protected]>
Tested-by: Leo Yan <[email protected]>
Cc: James Clark <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: John Garry <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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