selftests: openat2: Fix testing failure for O_LARGEFILE flag

The openat2 test suite fails on ARM64 because the definition of
O_LARGEFILE is different on ARM64. Fix the problem by defining
the correct O_LARGEFILE definition on ARM64.

"openat2 unexpectedly returned # 3['.../tools/testing/selftests/openat2']
with 208000 (!= 208000)
not ok 102 openat2 with incompatible flags (O_PATH | O_LARGEFILE) fails
with -22 (Invalid argument)"

Fixed change log to improve formatting and clarity:
Shuah Khan <[e-mail]>

Signed-off-by: Baolin Wang <[e-mail]>
Reviewed-by: Aleksa Sarai <[e-mail]>
Acked-by: Christian Brauner <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/openat2/openat2_test.c

···
  * XXX: This is wrong on {mips, parisc, powerpc, sparc}.
  */
 #undef	O_LARGEFILE
+#ifdef __aarch64__
+#define	O_LARGEFILE 0x20000
+#else
 #define	O_LARGEFILE 0x8000
+#endif
 
 struct open_how_ext {
 	struct open_how inner;