LF-4552 net: sched: remove duplicated code

The same patch "net: sched: add barrier to ensure correct
ordering for lockless qdisc" is duplicated with these
two commit ID (e7c3ae47
and 9486b3dd) in the process
of merge(commid ID: 8b0b3faf):

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>