perf shell completion: Restrict completion of events to events

'perf list' will list libpfm4 events and metrics which aren't valid
options to the '-e' option. Restrict the events gathered so that invalid
ones aren't shown.

Before:

  $ perf stat -e <tab><tab>
  Display all 633 possibilities? (y or n)

After:

  $ perf stat -e <tab><tab>
  Display all 375 possibilities? (y or n)

Committer testing:

  # grep -m1 'model name' /proc/cpuinfo
  model name	: AMD Ryzen 9 5950X 16-Core Processor
  #

Before:

  # . tools/perf/perf-completion.sh
  # perf stat -e
  Display all 2672 possibilities? (y or n)

After:

  # . tools/perf/perf-completion.sh
  # perf stat -e
  Display all 2648 possibilities? (y or n)

Reported-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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