VFS: Rolling Back the fmode macro definition and structure members

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5MFXJ


CVE: NA

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The readahead feature of the hulk-5.10 ebpf enhancement involves
interface changes and needs to be compatible with the ebpf tool
of version 4.19. This patch changes the _ctl_mode to _mode of
fs_file_read_ctx structure.

Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>
Reviewed-by: zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>