fanotify: generalize the handling of extra event flags

In fanotify_group_event_mask() there is logic in place to make sure we
are not going to handle an event with no type and just FAN_ONDIR flag.
Generalize this logic to any FANOTIFY_EVENT_FLAGS.

There is only one more flag in this group at the moment -
FAN_EVENT_ON_CHILD. We never report it to user, but we do pass it in to
fanotify_alloc_event() when group is reporting fid as indication that
event happened on child. We will have use for this indication later on.

Link: https://lore.kernel.org/r/20200716084230.30611-2-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

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