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 <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/cachestat/test_cachestat.c

···
 // SPDX-License-Identifier: GPL-2.0
 #define _GNU_SOURCE
+#define __SANE_USERSPACE_TYPES__ // Use ll64
 
 #include <stdio.h>
 #include <stdbool.h>