selftests: memfd: Align STACK_SIZE for ARM AArch64 system

The stack size should be 16 bytes aligned in arm64 system. The similar
patch has been merged already.

> <commit id: 1f78dda>
> selftests: memfd_test: Revised STACK_SIZE to make it 16-byte aligned
>
>    There is a mandate of 16-byte aligned stack on AArch64 [1], so the
>    STACK_SIZE here should also be 16-byte aligned, otherwise we would
>    get an error when calling clone().
>
>    [1] http://lxr.free-electrons.com/source/arch/arm64/kernel/process.c#L265
>
>    Signed-off-by: Chunyan Zhang <[email protected]>
>    Acked-by: Arnd Bergmann <[email protected]>
>    Signed-off-by: Shuah Khan <[email protected]>

Signed-off-by: Orson Zhai <[email protected]>
Reviewed-by: Sumit Semwal <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: Orson Zhai

tools/testing/selftests/memfd/fuse_test.c

@@ -33,7 +33,7 @@
 #include <unistd.h>
 
 #define MFD_DEF_SIZE 8192
-#define STACK_SIZE 65535
+#define STACK_SIZE 65536
 
 static int sys_memfd_create(const char *name,
 			    unsigned int flags)