mips: Fix compile warnings of perf "tests/attr.c" on mips64.

On mips64, we by default include '<asm-generic/int-l64.h> which results in __u64 being an unsigned long. This causes compile warnings which are treated as errors due to '-Werror'. This patch references commit e3541ec7.

---
 arch/mips/include/uapi/asm/types.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 7ac9d0b..8d959a0 100644
@@ -16,7 +16,7 @@
  * userspace to avoid code changes.
  */
 #ifndef __KERNEL__
-# if _MIPS_SZLONG == 64
+# if !defined(__SANE_USERSPACE_TYPES__) && _MIPS_SZLONG == 64
 #  include <asm-generic/int-l64.h>
 # else
 #  include <asm-generic/int-ll64.h>

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