perf mem: Add mem_events into the supported perf_pmu

With the mem_events, perf doesn't need to read sysfs for each PMU to
find the mem-events-supported PMU. The patch also makes it possible to
clean up the related __weak functions later.

The patch is only to add the mem_events into the perf_pmu for all ARCHs.
It will be used in the later cleanup patches.

Reviewed-by: Ian Rogers <[email protected]>
Reviewed-by: Kajol Jain <[email protected]>
Tested-by: Ravi Bangoria <[email protected]>
Tested-by: Leo Yan <[email protected]>
Tested-by: Kajol Jain <[email protected]>
Suggested-by: Leo Yan <[email protected]>
Signed-off-by: Kan Liang <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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