perf pmu: Add const to pmu_events_map.

The pmu_events_map is generated at compile time and used for lookup. For
testing purposes we need to swap the map being used.

Having the pmu_events_map be non-const is misleading as it may be an out
argument.

Make it const and update uses so they work on const too.

Reviewed-by: John Garry <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Andi Kleen <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Antonov <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andrew Kilroy <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Denys Zagorui <[email protected]>
Cc: Fabian Hemmer <[email protected]>
Cc: Felix Fietkau <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jacob Keller <[email protected]>
Cc: Jiapeng Chong <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Joakim Zhang <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Kees Kook <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nicholas Fraser <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Paul Clarke <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Riccardo Mancini <[email protected]>
Cc: Sami Tolvanen <[email protected]>
Cc: ShihCheng Tu <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Sumanth Korikkar <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Wan Jiabing <[email protected]>
Cc: Zhen Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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