io_uring: make spdxcheck.py happy

to #28170604

commit 9f5834c868e901b00f1bfe4d0052b5906b4a2b7f upstream

Commit bbbdeb4720a0 ("io_uring: dual license io_uring.h uapi header")
uses a nested SPDX-License-Identifier to dual license the header.

Since then, ./scripts/spdxcheck.py complains:

  include/uapi/linux/io_uring.h: 1:60 Missing parentheses: OR

Add parentheses to make spdxcheck.py happy.
Signed-off-by: NLukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>

include/uapi/linux/io_uring.h

-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note OR MIT */
+/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
 /*
  * Header file for the io_uring interface.
  *