xfs: let writable tracepoint enable to clear flag of f_mode

hulk inclusion
category: feature
bugzilla: 173267
CVE: NA
---------------------------

Adding a new member clear_f_mode into struct xfs_writable_file,
then we can clear some flag of file->f_mode.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>