perf pmu: Improve name/comments, avoid a memory allocation

Improve documentation around perf_pmu_alias pmu_name and on
functions.

Reduce the scope of pmu_uncore_alias_match to just file.

Rename perf_pmu__valid_suffix to the more revealing
perf_pmu__match_ignoring_suffix.

Add a short-cut to perf_pmu__match_ignoring_suffix for PMU names that
don't also have a socket value, and can therefore avoid a memory
allocation.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Suzuki Poulouse <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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