Documentation: arm64: Document the PMU event counting threshold feature

Add documentation for the new Perf event open parameters and
the threshold_max capability file.

Reviewed-by: Anshuman Khandual <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Signed-off-by: James Clark <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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