qmp_command: Disable qmp_query-mice test on s390x

The s390x machine does not support mouse.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

qemu/tests/cfg/qmp_command.cfg

@@ -15,6 +15,8 @@
             cmd_result_check = equal
             cmd_return_value = "{u'enabled': True, u'present': True}"
         - qmp_query-mice:
+            # No mouse support on s390x
+            no s390x
             qmp_cmd = "query-mice"
             post_cmd = "info mice"
             cmd_result_check = contain