perf vendor events arm64: Update N2/V2 events from source

Update using the new data [1] for these changes:

  * Scale some metrics like dtlb_walk_ratio to percent so they display
    better with Perf's 2 dp precision
  * Description typos, grammar and clarifications
  * Unnecessary metric formula brackets seem to have been removed in the
    source but this is not a functional change
  * New sve_all_percentage metric

The following command was used to generate this commit:

$ telemetry-solution/tools/perf_json_generator/generate.py \
  tools/perf/ --telemetry-files \
  telemetry-solution/data/pmu/cpu/neoverse/neoverse-v2.json:neoverse-n2-v2

[1]: https://gitlab.arm.com/telemetry-solution/telemetry-solution/-/blob/main/data/pmu/cpu/neoverse/neoverse-v2.json

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20241120143739.243728-1-james.clark@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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