selftests: cachestat: Fix build warnings on ppc64

JIRA: https://issues.redhat.com/browse/RHEL-50302

commit bc4d5f5
Author: Michael Ellerman <mpe@ellerman.id.au>
Date:   Tue May 21 13:01:11 2024 +1000

    selftests: cachestat: Fix build warnings on ppc64

    Fix warnings like:
      test_cachestat.c: In function ‘print_cachestat’:
      test_cachestat.c:30:38: warning: format ‘%llu’ expects argument of
      type ‘long long unsigned int’, but argument 2 has type ‘__u64’ {aka
      ‘long unsigned int’} [-Wformat=]

    By switching to unsigned long long for u64 for ppc64 builds.

    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Signed-off-by: Eric Chanudet <echanude@redhat.com>

Author: eric-ch

tools/testing/selftests/cachestat/test_cachestat.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #define _GNU_SOURCE
+#define __SANE_USERSPACE_TYPES__ // Use ll64
 
 #include <stdio.h>
 #include <stdbool.h>