dax: Add a wakeup mode parameter to put_unlocked_entry()

dax: Add a wakeup mode parameter to put_unlocked_entry()

As of now put_unlocked_entry() always wakes up next waiter. In next
patches we want to wake up all waiters at one callsite. Hence, add a
parameter to the function.

This patch does not introduce any change of behavior.

Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Link: https://lore.kernel.org/r/20210428190314.1865312-3-vgoyal@redhat.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>