perf trace: Remove arg_fmt->is_enum, we can get that from the BTF type

This is to pave the way for other BTF types, i.e. we try to find BTF
type then use things like btf_is_enum(btf_type) that we cached to find
the right strtoul and scnprintf routines.

For now only enum is supported, all the other types simple return zero
for scnprintf which makes it have the same behaviour as when BTF isn't
available, i.e. fallback to no pretty printing. Ditto for strtoul.

  root@x1:~# perf test -v enum
  124: perf trace enum augmentation tests                              : Ok
  root@x1:~# perf test -v enum
  124: perf trace enum augmentation tests                              : Ok
  root@x1:~# perf test -v enum
  124: perf trace enum augmentation tests                              : Ok
  root@x1:~# perf test -v enum
  124: perf trace enum augmentation tests                              : Ok
  root@x1:~# perf test -v enum
  124: perf trace enum augmentation tests                              : Ok
  root@x1:~#

Signed-off-by: Howard Chu <[email protected]>
Tested-by: Howard Chu <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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