perf mem: Scan all PMUs instead of just core ones

Scanning only core PMUs is not sufficient on platforms like AMD since
perf mem on AMD uses IBS OP PMU, which is independent of core PMU.
Scan all PMUs instead of just core PMUs. There should be negligible
performance overhead because of scanning all PMUs, so we should be okay.

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Ravi Bangoria <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ali Saidi <[email protected]>
Cc: Ananth Narayan <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Santosh Shukla <[email protected]>
Cc: Thomas Richter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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