btrfs: move root node locking helpers to locking.c
The helpers are related to locking so move them there, update comments. Reviewed-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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