perf bench numa: Make no args mean 'run all tests'

If we call just:

  perf bench numa mem

it will present the same output as:

  perf bench numa mem -h

i.e. ask for instructions about what to run.

While that is kinda ok, using 'run all tests' as the default, i.e.
making 'no parms' be equivalent to:

  perf bench numa mem -a

Will allow:

  perf bench numa all

to actually do what is asked: i.e. run all the 'bench' tests, instead of
responding to that by asking what to do.

That, in turn, allows:

  perf bench all

to actually complete, for the same reasons.

And after that, the tests that come after that, and that at some point
hit a NULL deref, will run, allowing me to reproduce a recently reported
problem.

That when you have the needed numa libraries, which wasn't the case for
the reporter, making me a bit confused after trying to reproduce his
report.

So make no parms mean -a.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Patrick Palka <patrick@parcs.ath.cx>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-x7h0ghx4pef4n0brywg21krk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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