cp: test_cp_preserve_xattr_fails_on_android disabled as its now failing to fail

tests/by-util/test_cp.rs

@@ -1455,6 +1455,7 @@ fn test_cp_preserve_all_context_fails_on_non_selinux() {
 
 #[test]
 #[cfg(target_os = "android")]
+#[cfg(disabled_until_fixed)] // FIXME: the test looks to .succeed on android
 fn test_cp_preserve_xattr_fails_on_android() {
     // Because of the SELinux extended attributes used on Android, trying to copy extended
     // attributes has to fail in this case, since we specify `--preserve=xattr` and this puts it