perf bench: List output formatting options on 'perf bench -h'

So 'perf bench -h' is not very helpful when printing the help line
about the output formatting options:

    -f, --format <default>
                              Specify format style

There are two output format styles, 'default' and 'simple', so improve
the help text to:

    -f, --format <default|simple>
                              Specify the output formatting style

Signed-off-by: Ingo Molnar <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Hitoshi Mitake <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Removed leftovers from the mem-functions.c rename ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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