The cpumap is dummy, so no need to go on figuring out affinity.o

This way we reduce the setup time for simple scenarios like:

	$ perf stat sleep 1
Acked-by: NAndi Kleen <andi@firstfloor.org>
Acked-by: NIan Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>