perf tests: Add some pmu core functionality tests

Test behavior of PMU names and comparisons wrt suffixes using Intel
uncore_cha, marvell mrvl_ddr_pmu and S390's cpum_cf as examples.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: James Clark <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Bharat Bhushan <[email protected]>
Cc: Bhaskara Budiredla <[email protected]>
Cc: Tuan Phan <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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