perf pmus: Describe semantics of 'core_pmus' and 'other_pmus'

Notion of 'core_pmus' and 'other_pmus' are independent of hw core and
uncore pmus. For example, AMD IBS PMUs are present in each SMT-thread
but they belongs to 'other_pmus'. Add a comment describing what these
list contains and how they are treated.

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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