fanotify: use helpers to parcel fanotify_info buffer

fanotify_info buffer is parceled into variable sized records, so the
records must be written in order: dir_fh, file_fh, name.

Use helpers to assert that order and make fanotify_alloc_name_event()
a bit more generic to allow empty dir_fh record and to allow expanding
to more records (i.e. name2) soon.

Link: https://lore.kernel.org/r/20211129201537.1932819-7-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

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