perf test session topology: Fix test on s390

On s390 this test case fails because the socket identifiction numbers
assigned to the CPU are higher than the CPU identification numbers.

F/ix this by adding the platform architecture into the perf data header
flag information. This helps identifiing the test platform and handles
s390 specifics in process_cpu_topology().

Before:

  [root@p23lp27 perf]# perf test -vvvvv -F 39
  39: Session topology                                      :
  --- start ---
  templ file: /tmp/perf-test-iUv755
  socket_id number is too big.You may need to upgrade the perf tool.
  ---- end ----
  Session topology: Skip
  [root@p23lp27 perf]#

After:

  [root@p23lp27 perf]# perf test -vvvvv -F 39
  39: Session topology                                      :
  --- start ---
  templ file: /tmp/perf-test-8X8VTs
  CPU 0, core 0, socket 6
  CPU 1, core 1, socket 3
  ---- end ----
  Session topology: Ok
  [root@p23lp27 perf]#
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Fixes: c84974ed ("perf test: Add entry to test cpu topology")
Link: http://lkml.kernel.org/r/20180611073153.15592-2-tmricht@linux.ibm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/topology.c

@@ -45,6 +45,7 @@ static int session_write_header(char *path)
 
 	perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
 	perf_header__set_feat(&session->header, HEADER_NRCPUS);
+	perf_header__set_feat(&session->header, HEADER_ARCH);
 
 	session->header.data_size += DATA_SIZE;