fs/ecryptfs: remove kernel-doc warnings

Remove kernel-doc warnings:

fs/ecryptfs/mmap.c:270: warning: Excess function parameter 'flags'
description in 'ecryptfs_write_begin'

Message-ID: <20230731112533.214216-1-wangzhu9@huawei.com>
Signed-off-by: Zhu Wang <wangzhu9@huawei.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/ecryptfs/mmap.c

@@ -255,7 +255,6 @@ out:
  * @mapping: The eCryptfs object
  * @pos: The file offset at which to start writing
  * @len: Length of the write
- * @flags: Various flags
  * @pagep: Pointer to return the page
  * @fsdata: Pointer to return fs data (unused)
  *